How do you plant seeds in a garden bed full of mulch? America’s favorite retired college horticultural professor, Debbie Flower, and I quickly answered that and then veered into a very scenic bypass - as is our custom. This time: we rank garden mulches from best to worst. If you want to know the best products to use for a mulch - and the ones to avoid - you’ll want to listen.
Also: what the worms in your worm bin are trying to tell you about what they want in order to be happy, this fall and winter.
It’s episode number 284, Mulches Ranked from Best to Worst. Fall Worm Bin Care.
We’re podcasting from Barking Dog Studios here in the beautiful Abutilon Jungle in Suburban Purgatory. It’s the Garden Basics with Farmer Fred podcast, brought to you today by Smart Pots, and Dave Wilson Nursery. Let’s go!
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Pictured: Four High-Ranked Mulches: Arborist chips, compost, straw, shredded leaves
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284 TRANSCRIPT Mulches, Worms
Farmer Fred 0:00
Garden Basics with Farmer Fred is brought to you by Smart Pots, the original lightweight, long lasting fabric plant container. It's made in the USA. Visit SmartPots.com slash Fred for more information and a special discount, that's SmartPots.com/Fred.
Welcome to the Garden Basics with Farmer Fred podcast. If you're just a beginning gardener or you want good gardening information, you've come to the right spot.
Farmer Fred
Today’s episode begins quite simply as an answer to a question, how do you plant seeds in a garden bed full of mulch? Good question. America’s favorite retired college horticultural professor, Debbie Flower, and I quickly veered into a very scenic bypass - as is our custom. This time: we ranked garden mulches from best to worst. If you want to know the best products to use for a mulch - and the ones to avoid - you’ll want to listen. And then we talk with Master Gardener Susan Muckey - the self-proclaimed worm whisperer - and she shares with us what the worms in your worm bin are telling her about what they want in order to be happy, this fall and winter.
Mulches and worm castings! Two topics that brighten up my gardening heart.
It’s all right here, in episode number 284, Mulches Ranked from Best to Worst. Fall Worm Bin Care.
We’re podcasting from Barking Dog Studios here in the beautiful Abutilon Jungle in Suburban Purgatory. It’s the Garden Basics with Farmer Fred podcast, brought to you today by Smart Pots, and Dave Wilson Nursery. Let’s go!
MULCHES RANKED FROM BEST TO WORST
Farmer Fred
We are answering your garden questions here on the Garden Basics podcast, I always bring in the chief answerer, America's favorite retired college horticultural Professor. Debbie Flower is here. Patty in Petaluma has a question for us.
Patty in Petaluma 1:59
Hey, Farmer Fred and Debbie Flower. This is Patty. I live in Petaluma, California.USDA Zone 9b. Quick question. I grow mostly in raised beds. But I also grow mostly from seed. I really want to mulch, but how will those seeds sprout through the mulch? Thank you.
Farmer Fred 2:18
Petaluma is in Sonoma County here in Northern California. And Patty is growing mostly in raised beds, and she grows from seed. And that's really great. But she wants to use mulch. But how will those seeds sprout through the mulch, she asks. Well, it's a fair question. Because this confuses me. Some seeds need light. But if they're buried, down in the soil, but not by much, how do they sprout?
Debbie Flower 2:44
Some seeds need light, some seeds need darkness, and some are kind of in the middle. And you can research that. Or, if these are seeds in a commercial seed packet, they will tell you on the package if the seeds need light to germinate. And that means you put them on the surface of the soil. And so they receive light, and you hope they don't dry out. And that can be tricky.
Farmer Fred 3:05
Yeah. And if they call to be covered, you don't want to cover it by too much. So would that be the reason that mulch on top of a new seed bed may not be a good idea?
Debbie Flower 3:16
Yes. Well, there are two reasons. One, if it may result in the seed being too deep underneath media and mulch, or it may be if it's depending on what the mulch is made of. The mulch itself may be too heavy. And the baby plants that grow from the seed can't push the heavy mulch out of the way.
Farmer Fred 3:35
The plant doesn't come out of the ground like Popeye, after a can of spinach. No. I mulch on my beds. The garden beds spend the fall and winter with shredded leaves on top of the bed. Come late winter, early spring and I want to plant from seed in the bed, I usually just clear off a little row, just a few inches wide. And I plant in that row.
Debbie Flower 3:58
Right. And so you move the mulch away or if you haven't applied yet, you don't apply it exactly where you put the seed. The one thing you can use is vermiculite.
Farmer Fred 4:09
Oh, to cover the seed. But not too thickly, I would imagine.
Debbie Flower 4:13
Well, I've had students do it thicker than I thought was a good idea. Kind of maybe quarter to a half an inch, so you can't see the soil at all. And the seeds have come up anyway. And they were seeds that need light. That's one of the beauties of vermiculite. It reflects light.
Farmer Fred 4:30
Would you only use vermiculite, then, for those seeds that need light?
Debbie Flower 4:33
I use it on everything because it traps moisture. It holds moisture. The seed has to remain wet, once it starts to germinate. Even if you can't see that it's germinating, stuff is going on inside that seed. If it dries out, it dies. And so vermiculite holds an extra amount of moisture over the seed and without drowning the seed. And also, if the seed needs light, it provides that or allows light to get to the seed.
Farmer Fred 5:01
We can make it easy for you, too. If you want to do that, you can just buy a commercial seed starting mix and cover that seed with a very thin layer. Right?
Debbie Flower 5:10
For me the beauty of vermiculite is I can see it. So I know where the seeds are. Whereas with a seed starting mix, it would probably blend into my soil in my raised bed and I wouldn't know the exact location of the seed.
Farmer Fred 5:23
Well, you're not going to know it anyway, after you water it in.
Debbie Flower 5:27
The vermiculite is visible, not forever, but for generally until the seed germinates.
Farmer Fred 5:33
Now, the question is, what sort of mulch should you use? I mean, you're gonna move that mulch back near the plant after it is strong enough and taller than the mulch, right? And you would still not touch that plant with the mulch, right? Just bring it nearby. And it'll live happily ever after. We can hope. But it depends on the mulch. Recently, the Sacramento Tree Foundation conducted a little experiment, ranking mulch materials from best to worst. And this is talking about mulching established plants, especially trees and shrubs. After all, this is the Tree Foundation. So they're looking at trees and shrubs, they're looking to employ a mulch to do what mulch does best. It increases soil moisture content. By modifying the soil structure, it increases the porosity of the soil, it decreases salt buildup in the plant root zone, it adds organic matter to the soil as the mulch breaks down, thus increasing the nutrient content. It decreases soil borne diseases. And it increases the growth of trees and other woody perennials that are planted under them. So there's a lot of good reasons for using mulch because of water and soil temperature and weed control. Things like that. And when you are adding mulch to the soil, you're just adding it to the top of the soil.
Debbie Flower 6:57
Right you are. You're noticing it in the definition of mulches. It's on the surface. An amendment is something that you mix in. Amendments are not what we're not talking about. We’re talking about a mulch.
Farmer Fred 7:09
Explain why you don't want to incorporate mulch into the soil.
Debbie Flower 7:15
There are many different kinds of mulches, and they vary in what they do once they're mixed into the soil. But a number one reason is that the microorganisms that break down that mulch, we're talking about organic mulch now, so it could be sawdust, it could be grass clippings, bark from trees or chippings from a whole tree, but those micro-organisms that break that down, will rush away from the plants that are actively growing and work on the mulch itself and they need some nutrition themselves to work on that mulch to break it down and release the nutrients within the mulch, and so they take the nutrition away from the existing plants.
Farmer Fred 7:58
The best mulch that, according to the Sacramento Tree Foundation you can use, is natural wood chips, also known as arborist wood chips. It's mulch that's made from all parts of a tree. When they cut a tree down, you've got all those things: you got leaves and twigs and bark and wood, and when applied in a layer four to six inches thick, the uneven size of the woodchips allows them to lock together. It forms a thick mat that blocks weeds, retain soil moisture, insulates roots from extreme temperatures. It also improves the soil over time, lessening compaction, feeding beneficial soil microbes, providing nutrition for your tree. And as long as you apply it correctly on top of the soil, and maybe even put a layer of compost beneath that mulch, that will serve as a little extra nutrient boost. But you've also talked about something that a lot of people will say, ”I did not know that”. And that is that mulch protects your garden from rainstorms, in a good way.
Debbie Flower 8:55
Yes. Rainstorms and overhead irrigation, the water coming down from above, whether it's from your spray irrigation or from raindrops, is so powerful that when it hits the soil, it can cause soil compaction, it can break down soil structure into the tiniest little particles of soil. And then they find their way between other particles. And pretty soon your soil is very, very hard and compacted. And compact soil limits the ability of oxygen and water to get to the plant roots. So it's not a good thing for the plant.
Farmer Fred 9:27
A lot of people ask me, “How do you get a tree company to drop off a load of these wood chips of some tree that they cut down?” It used to be you could go up to the truck when you heard the loud engine of the chipper/shredder. You've told the famous story of being awakened by the sound of a chipper shredder early one morning and dashing out the door.
Debbie Flower
Yes, yeah, to find that. Gotta find it and see if they'll drop it off in my yard.
Farmer Fred
Yes. I think now they've been trained to say, “Oh, just call the office. We'll put you on the list.”
Debbie Flower 9:56
Right. It's become more and more popular for people to want those chips and so that is the response I got most recently when I did that, right.
Farmer Fred 10:03
Yeah. And most companies are glad to do it. And it's nice that it's centrally controlled. You may not get it that day. But at least you're on the list. I often worry, though, about that load of a tree that they took down. Why did they take the tree down? Was there a disease or a pest associated with it that could transfer to my garden?
Debbie Flower 10:24
That's a good question. And there could have been a pest or disease in that plant that was taken down. But all research has shown that those diseases and insect pests and fungus and bacteria, all those things, do not survive the process of the chipping and then the moving of the pile. They rely on the intact plant in order to live. Termites don't live in wood mulch. They rely on bigger pieces of wood not on this chipped up stuff that's piled up with lots of air between it. It gets wet, it dries out, it's a very different environment. So the diseases, as well as the insect pests, etc, that may have caused the demise of the tree do not survive the process, so they don't come to your house. The one thing that does have that potential, is a seed. I have had things come up in my yard from seed that came in the chipped load.
Farmer Fred 11:20
How many loads have you ever received? And was there ever liquidambar seed balls in there?
Debbie Flower 11:26
Liquidambar. Yes. My son had a load delivered and all these golden rain trees came up. Koelreuteria. And I had a Casuarina in my yard because it came as seed in the mulch.
Farmer Fred 11:39
Casuarina is the Mountain She-Oak?
Debbie Flower
Yes. Or the river She-oak. Yeah.
Farmer Fred
What about eggs, insect eggs? Can they survive the chipping job?
Debbie Flower 11:48
They would be chipped. They will be physically beaten up.
Farmer Fred 11:51
It's not a bad mix, if you think about it. When they chop down a tree, you're gonna get leaves, you're gonna get twigs, you're gonna get the bark, the wood and everything. But all of that is basically delivered to you in different sizes. So things are going to break down quicker. So it's really a nice process for slowly feeding the soil as it breaks down. So anyway, the chipped and shredded tree parts is the Sacramento Tree Foundation’s best idea of a mulch product to use: natural wood chips. Okay, let’s get back to the list, the next category is down a notch from best: they talk about bark. And a lot of people when you think of chips, shredded tree parts and think well, I'll just go down to the nursery and buy some bark, or I'll go to the sand and gravel place and buy a truckload of bark. There have been warnings about using colored bark. There have been warnings about using fine bark, usually called go more common here probably in California because usually redwoods right that do that. And that has a tendency to smolder if a cigarette gets in there. Colored bark. I don't like the look of it myself.
Debbie Flower 12:57
Yeah, it's usually the cheapest stuff. So you may not be alone. Yeah.
Farmer Fred 13:00
But that it includes chunks of the trees, outer bark, you're right. So it's all the same size. Parts of it are not going to break down sooner than others, right.
Debbie Flower 13:12
And bark is the part of the tree that contains a lot of waxes and oils. And those slow down the breakdown of that mulch. So a better place I think for the bark alone. The stuff you buy in bags or get at the local supply store is pathway bark, designed to be walked on. And there's a certain size that is pathway bark. And you don't want it to break down very fast. So that it will break down more slowly than the mix. It will break down eventually but much more slowly than the mix of the arborist chips.
Farmer Fred 13:44
Pathway bark is fairly small. It's about one inch. Pathway bark is also suggested as one of three ingredients in making a blueberry soil mix, along with peat moss and a rhododendron-azalea- camellia soil mix. And a handful of soil sulfur. Don’t forget that. All right, but that's for blueberries. They did have one suggestion though: if you're gonna go buy commercial bark…
Debbie Flower 14:14
Because you liked the look, because you like a uniform look, and it does break down more slowly than the the bark chips from the arborist…
Farmer Fred 14:21
Put down the chipped/shredded tree parts first and then top that with your commercial bark. Right?
Debbie Flower 14:26
You'll get that look. Yeah, it's so uniform.
Farmer Fred 14:29
Yes. Everybody becomes rich except you. Back to the mulch rankings. it's not rated best, it’s rated okay. And that's shredded leaves, straw, lawn clippings, and compost. Organic Materials like leaves will break down over time enriching the soil, encouraging a healthy soil microbiome, they say, and feed your tree. They are best combined with heavier organic matter like wood-chips. Only use weed free sources. I'm a big believer in shredded leaves, because they are free.
Debbie Flower 15:01
Okay, all those things were green: shredded leaves, straw, lawn clippings, compost. The biology of the soil is influenced by what the soil is fed. If you are growing trees and you feed the soil with a tree mulch that breaks down and the nutrients get into the soil, the microorganisms that proliferate in that soil are the ones that help trees. If you're growing herbaceous things, herbaceous things are green things like your vegetable garden, or your flower garden, or your bulbs. They are green, and they benefit - while growing - more from mulches that came from green things. The biology of the soil actually changes because the things that break down the softer herbaceous green things are different. And so it becomes a fungus/bacteria balance or imbalance. So it's a predominance, it doesn't mean that the others have gone away. It's just that because of what you're feeding the soil, one predominates over the other, and one favors trees and the other favors herbaceous things,
Farmer Fred 16:10
I think the easy way to solve that issue is get yourself a chipper shredder. And let's say you have a vegetable garden, and it’s at the end of the season. Chip and shred your vegetable plants, right? And use that. Or you can put that in a compost pile and let it sit as a compost pile if you want, and then use that as a layer of mulch, even though it's compost, right.
Debbie Flower 16:35
I wouldn't even hesitate to just use it right out of the chipper shredder. It's not going to grow, you know, probably doesn't have any seeds in it. Because you're not using the fruit. Nothing is coming up.
Farmer Fred 16:46
What about tomato seeds from a stray tomato in a tomato plant.
Debbie Flower 16:49
Okay, then that could be a problem, then you would want to put it into the compost.
Farmer Fred 16:54
Yeah, exactly. process it. Yeah, compost it for a few months. And If you're worried about a load you're getting from a chipper shredder from a arborist, and they dump it in your driveway. If your neighbors don't mind, let it sit for a month or so and it gets a really hot center.
Farmer Fred 17:13
I did that as a little experiment one time. I took my soil thermometer with a 36 inch probe and stuck it in a 10 yard, 10 cubic yard pile of chips and shredded tree parts. It was 140 degrees in the pile.
Debbie Flower 17:29
That's the temperature you want a compost pile to get to and stay at for several hours to kill the bad stuff, the seeds and that kind of thing in there. So but yes, in a composting situation, you would turn the outside into the center and and let the process occur again.
Farmer Fred 17:48
And here's something that's counterintuitive. Would you add water to increase the soil temperature, to increase the temperature of that compost pile?
Debbie Flower 17:55
Once it has dried out you need to add water. Yes, you don't want to add it so it becomes soggy. If it smells bad, or sour, then you've added too much water. And that's common. People add too much water to their compost pile. There's a compost experiment plot in Tucson, Arizona. And I don't know if it's still there, but I visited it a long time ago. And the number one thing that they know Tucson is very hot, very dry. And so you would think if you need water in a compost pile anywhere it would be there. But their results showed that the number one thing you need is to turn the compost pile it needs oxygen that the microorganisms run out of oxygen first and they die. So if you turn the pile, you add oxygen. That way a proportion of the population of microorganisms stay alive and are able to do their work, to break down the next stuff that has appeared because of your turning.
Farmer Fred 18:54
If you do want to ensure that that pile from the arborist is okay, and you have an errant teenager living in your house for punishment, tell them to turn the pile.
Debbie Flower 19:06
One year when I was working at the Skill Center and the students took care of the landscape and a vegetable garden and we had them collect all this stuff. And we had a concrete pad up against a brick building and where there were no doors or windows and we piled the compost there and then every day we went out and moved it, from one corner to the other corner of the concrete pad and the brick building every day. We had completed compost in two weeks.
Farmer Fred 19:31
There was no time for class that way.
Debbie Flower 19:34
You know, you got 15 kids out there with shovels. It doesn't take that long.
Farmer Fred 19:39
That's right. Yes. Youth and shovels. There you go. A good combination. Now also under that “okay” category is shredded leaves, straw, lawn clippings and compost. Let's talk about straw first. When you buy a bale of straw, make sure it's a bale of straw, not a bale of hay.
Debbie Flower 19:59
Hey, hay has weeds, right? Hay is the seedy stuff.
Farmer Fred 20:04
So, you want to buy straw. Straw is fine. I like to use straw for walkways especially, but it's fine as a mulch. I've got one bed covered in straw out back. And I’ll be planting onions there in the next month or so. So I'll be removing that or moving it aside and planting. Okay. Lawn Clippings scare the bejesus out of me.
Debbie Flower 20:25
Because of the pesticides used in lawn products?
Farmer Fred 20:28
Because of that, or it's Bermuda grass. Oh, yes, yes. And if you've got a turf type that grows via seeds, stolons and rhizomes, chances are you ain't ever killing it.
Debbie Flower 20:40
Creeping red fescue is stoloniferous. And also, I believe Kentucky blue is stoloniferous. So if you're not from California, where Bermuda grass is your nemesis, there are other stoloniferous grasses that will survive or may survive because of their stems, their rhizomes. That's the thing about Bermuda grasses. It has both stems that creep along the surface of the soil that may survive the composting process longer than the leaves do. And so you may not realize that you're putting live stems out as your mulch.
Farmer Fred 21:14
I became a homeowner in my pre Master Gardener days. And I remember listening to a gentleman talk about the benefits of using grass as mulch in your garden bed. And he never specified about the different types of grass. So I just cut my lawn and threw it on top of the raised bed. Did I ever grow a fabulous crop of Bermuda grass in that raised bed? I tell you, I bet it was forever, too.
Debbie Flower 21:40
Yeah, my dad in New Jersey would cut the grass and then put the grass, we didn't have Bermuda grass, but he would put it into a metal garbage can and he took the temperature of it with his long shanked soil thermometer too, and it got really, really hot really, really fast. Grasses can, if the layer is too thick, if grasses laid too thick, as it breaks down, it becomes sort of slimy and then it sticks to the other grasses and it can also create a cap over the surface of the soil. Another reason not to use lawn clippings.
Farmer Fred 22:11
You must be a teacher because you explained that without using the word anaerobic. But yeah, too thick of a layer of a grass mulch can cause an anaerobic situation. You want air and water to permeate to the soil. So you don't want to use lawn clippings in that regard. So if you're going to use lawn clippings, please please please don't use them in the same season that you may have used a weed and feed product. When you go and buy a lawn fertilizer these days it seems like there's more bags of weed and feed products than there is of just straight fertilizer for lawns. So you have to shop very carefully because some of these, especially the post emergent weed controls that are included in these Weed n feed products are, to use a euphemism, “persistent”, meaning they can last a long time. Despite the composting process of I've heard three years or five years .
Debbie Flower 23:04
Yeah, I I was thinking one was not enough from some things we've talked about in the past. Yeah, herbicides on lawns are some of the most destructive. Maybe it's because we use more of them as a population than we use other herbicides.
Farmer Fred 23:18
So if you're going to be planting a garden in the garden bed from seed, I would advise against using lawn clippings as a mulch if in the previous season you applied a weed n feed product, just because of the persistence of certain post emergent herbicides which could affect it. It’s not like a pre- emergent stopping the weeds, the plants that you planted from seed would come up, but they would be overtaken by the post emergent remnants in that base.
Debbie Flower 23:43
So they would probably grow poorly and be distorted. That to me, that distortion, is the number one symptom of herbicide damage. And distortion means they're wrinkled or their leaves are misshapen or turning the wrong way or things like that.
Farmer Fred 23:59
If you still have that bag of weed and feed in your shed, and you were thinking of using lawn clippings as a garden mulch, read the ingredients on the bag, do an internet search of those ingredients and see what the persistence of the active ingredients in the post emergent herbicide are.
Debbie Flower
You used a lot of big words there.
Farmer Fred
I did use a lot of big words that I didn't mean to. But basically, get out the magnifying glass, read that label. And you're gonna have to be your own cop on this and look up the problems associated with each of those active ingredients for post emergent weed controls. Because post emergent means after the weed comes up, it kills a living plant.
Debbie Flower 24:40
So glyphosate - Roundup is an example of a post emergent herbicide - is not one that causes the damage you're talking about. But we only the things we apply it to are damaged by it. It doesn't prevent seeds from germinating.
Farmer Fred 24:54
The persistence of glyphosate is not as nefarious as the persistence of certain other active ingredients. Yes. If you see plants coming up that look funny, right, that should be at the top of your suspect list.
Debbie Flower 25:06
I was called in, when I worked for Cooperative Extension to a property that had, I think they were blackberries. It was spring and they were coming up from a previous season. They were perennials they had lived there previously, lost their leaves over the winter coming back. And they were all distorted. And the people wanted to know why. And it was obviously to me herbicide application that had been done in the fall. The herbicide was absorbed by the plant went to the roots, stayed over the winter. And then when the new growth occurred in spring, it was back.
Farmer Fred 25:39
Be careful. Another mulch that is gaining in popularity that the Sacramento Tree Foundation puts it in its secondary list of mulches to use. It's not in the best category, but in the “ok” category, and that's cardboard. Cardboard is very popular these days. For sheet mulching, if you want to convert a lawn to a garden, not a bad idea, and it's not the summertime, you would sheet mulch. Yes, you can look up sheet mulching. We will have a link to more information about sheet mulching in today's show notes. And sometimes it's called lasagna mulching as well, where cardboard is layered with newspaper. And that's beneath wood chips to smother the grass naturally. The cardboard eventually breaks down to enrich the soil. However, it can prevent water in the meantime, from reaching tree roots.
Debbie Flower 26:29
you're right. The people who don't like cardboard, that that's their sticking point. It is that it can prevent water from reaching the soil. Especially if it's waxed cardboard. And they say use unwaxed cardboard, and I'm thinking, how do you know? Well, yes, and most commercial boxes if you're receiving deliveries from whatever delivery truck that drives up your driveway and leaves a box on your porch, most of those are waxed, some are more waxed than others. If you're getting fish, or my grandfather shipped me oysters once. Boy, that box was really waxed. But others the cardboard is waxed because the delivery person might be running through the rain. And the thing inside might be damaged by water. So they wax almost all boxes.
Farmer Fred 27:12
Yeah. And the other things that do not feed soil are packing tape and staples.
Debbie Flower 27:18
Staples, I've been thinking about that tea bag thing we talked about a long time ago. I wouldn't worry too much about them in terms of soil toxicity or soil nutrition. There are metals in soil or it is rock or is what metals are made from and rock is what soil is made from. So there are metals in soil. Its toxicity is always about concentration, how much you have in one location. And I suppose I think the bigger problem with the cardboard staples are that they're huge, or they can be huge. And you can step on them and hurt yourself or cut yourself.
Farmer Fred 27:52
Yes. So try to remove as many as possible if you can. One tip that they have though, if you do want to use cardboard, is be sure to thoroughly soak the soil before applying cardboard and then soak each layer of cardboard as well. And periodically check the soil underneath to ensure that water is still reaching the roots all around the trees drip line. And where does the trees drip line go?
Debbie Flower 28:17
Well, it keeps moving out. But it is at the very edge of the branches, if not further. Yes, yeah. Yes, I did this once, this type of mulching with cardboard. And I have to say it's very difficult to wet each cardboard thoroughly. You know, you get the boxes, you break them down. You lay them down, you pour water on them, well, they got wax on them so they don't absorb water very well. So we walk over it and try to break it up. And that part is very difficult.
Farmer Fred 28:42
Immediately my brain thinks of oh, just throw them in the pool and come back the next day.
Debbie Flower 28:46
They'll be on the bottom and it'll be really heavy.
Farmer Fred 28:51
But yeah, whatever it takes. All right. Now we come to the Sacramento Tree Foundation's “not ideal” set of mulches to use. Ones that you may not want to use. Now we talked about grass clippings.
Debbie Flower 29:01
but they're talking about live grass, I had to read through it to figure it out.
Farmer Fred 29:05
All right, I guess I have to read something now. They say, grass competes with tree roots for water and nutrients. We know that and it secretes chemicals that inhibit tree growth. Additionally, trees have different water requirements from grass. Trees and shrubs need a slower and deeper soak. If you want your young trees to grow fast, keep grass away from their root zones. They’re talking about growing grass beneath trees.
Debbie Flower 29:32
There's debate about whether the grasses really do give off chemicals and prevent the growth of trees. Is it that or is it I don't think that's been proven? Correct me somebody if I'm wrong.
Farmer Fred
Juglone!
Debbie Flower
That’s from Walnut trees. But I think it's just the competition. Grasses have the most dense root system of all plants that have been looked into. They're gonna get the water and fertilizer first. Yeah. They're at the surface and man do they have a lot of roots.
Farmer Fred 30:01
There's another very, very good reason for not growing grass right up to your trees and shrubs. And that is the number one cause of tree failure: it is injury to the trunk. Injuries to the trunk caused by mowers and weed whackers getting too close to that tree. Weed whacker disease. That's the one of the best reasons to keep away.
Debbie Flower 30:26
it's healthier for the tree. So yeah, don't have grass growing under your tree. In fact, have it way away from your tree, your tree will grow much better.
Farmer Fred 30:36
I remember Steve Zien always mentioning the fact that if you do have a tree growing in a lawn, is of course clear it away from the trunk of the tree. But then lay down and auxilary soaker hose in a concentric circle around the tree, extending out to the outer dripline of the tree, and running that separate from your lawn sprinkler.
Debbie Flower 30:57
Yes, it does need different irrigation than the lawn.
Farmer Fred 31:00
And here's one that I don't know why they don't have it in the “bad” group. But they have it under the category, “not ideal”. Not ideal. No, it's bad. But they call it not ideal. Permeable landscape fabric. That is the plastic rolls you buy that you can see through and if you place it down correctly, water flows through it and air theoretically flows through it, but it's plastic. Did you ever try to remove landscapey fabric?
Debbie Flower 31:32
I did. I sent you a picture.
Farmer Fred 31:35
it's not easy. And it just comes up in shreds. and you'll have it forever. You'll find it years later.
Debbie Flower 31:41
it comes up all on its own. Once it starts breaking down, and the roots of many things like weeds grow right through it.
Farmer Fred 31:50
Nutsedge and Bermuda grass will grow directly through landscape fabric. And as leaves, mulch, dust or other other organic materials accumulate and break down on top of the landscape fabric, weeds are able to germinate in this top layer anyway. And then when you go to pull that weed out, you bring the weed cloth up with it. And unfortunately, you won't be bringing up the whole entire weed cloth. That would be nice. It is just a little piece that you would be bringing up. This fabric serves as a barrier that prevents nutrients from cycling back into the soil.
Debbie Flower 32:22
Yeah, it's a bad thing. Yeah, it's certainly not ideal, but it's really bad.
Farmer Fred 32:25
Well, the one thing that's worse than that, would be… let’s see if it is in their worst category. Let's see. Yeah, it is. Plastic weed block, which is basically just sheets of solid plastic.
Debbie Flower 32:39
Right? And nothing gets through that.
Farmer Fred 32:42
Yeah. And you do want air and water and fertilizer to get through. Plastic will stop it. And you end up with a lot of roots at the surface.
Debbie Flower 32:51
Yeah, it's not only preventing the water and nutrients from getting to the roots, but it's resulting in an unstable tree. Because those surface roots, in a big windstorm, big rain and windstorm, they're not deep enough to hold the plant upright, and so it'll blow right over.
Farmer Fred 33:07
So we skipped over one category because that plastic mulch, the solid plastic mulch was in their worst category, they only have one in the bad category. And that's artificial turf. I'm torn on that, because I live with a golfer. They want to put in a putting green. I'm not going to be mowing bent grass, I'll tell you that much. If there's going to be a putting green on my property, it's going to be artificial turf. Even if it's just a small section. I don't have a problem with it.
Debbie Flower 33:39
I've watched somebody who lives near me convert their yard from a Lawn, growing green grass to artificial turf, with olive trees planted in areas between it. It just happened, so it looks lovely. They built a little wall around it and so you don't get up close to the artificial turf. From afar, It looks nice. But I don't know how those olives are gonna do.
Farmer Fred 34:02
I'd be curious to see how lumpy that artificial turf becomes in a couple of years or so. Because the roots are going to stay near the surface. Yes, I mean, if you're going to have a putting green with artificial grass, artificial turf, you don't want to plant any tree or shrub within 15 feet, if not more.
Debbie Flower 34:20
You want to have the tree to have the ability to get a good root system before it hits that location.
Farmer Fred 34:25
So in this case, I'm neutral on artificial turf. If you do it correctly, I don't think it's a problem. I consider it hardscaping
Debbie Flower 34:32
Yes, yes. Like a patio. Yeah.
Farmer Fred 34:35
Just do it right. Okay. And nothing looks worse than a yard, especially a front yard, than artificial turf installed poorly. I won't mention who they are. I don't actually I don't know who they are, but down the street, is a front yard with artificial turf. And they still have the sprinklers installed and they turn the sprinklers on it.
Debbie Flower 34:54
Dusting it maybe?
Farmer Fred 34:57
I think it's a case of they forgot where they put the sprinkler control box.
Debbie Flower 35:00
So, okay.
Farmer Fred 35:03
I never understood that anyway. Okay, but getting back to their “worst” category that included the plastic weed block is another one. You and I both talked about worst, well, maybe not rocks and gravel.
Debbie Flower 35:17
Yeah, I'm not so down on that. I don't want that in my yard because I like to plant everywhere and rocks and gravel, you can't just dig easily amongst them and put something new in or put it on irrigation line through them, that kind of thing. But as far as the problems the Tree Foundation came up with, are heating up the soil and the weight, slowly compacting the soil over time, I don't know that I agree with that.
Farmer Fred 35:44
That’s been tested locally here, because the subject comes up since the heat in Sacramento can get rather intense and times over 100 degrees or so. And they studied the effect of rock mulch around maple trees, Japanese maple trees.
Debbie Flower 35:59
Which would be very sensitive to heat. This is not their ideal environment, right?
Farmer Fred 36:03
They discovered that the high temperatures transferred on a hot day from the rocks into the soil only went a few inches deep. Not too deep, not to where, theoretically, the roots are. But that means the tree was planted properly. And it has been watered correctly. So there is that too. I mean, you can't put down rocks and walk away. That plant needs water. And how does water get through rocks? Slowly, slowly?
Debbie Flower 36:26
Yeah, it still protects the soil from compaction. I have trouble with their weight slowly compact soil over time. The rocks aren't jumping up and down. And they're just sitting there. They're just sitting there. What would make them push harder over time? People walking on them? Yeah, that's a potential if they're kind of rocks or gravel people might walk on. But other rocks, unless they're huge, people in general, don't walk on. And if they're huge, they're so heavy to begin with that the weight of a human isn't going to change things.
Farmer Fred 37:00
I like the idea of rocks for a pathway. I don't like kneeling on rocks to do gardening on the plants adjacent to the rock pathway. Yes, that's for sure.
Debbie Flower 37:16
Rocks and gravel. Not great, but I don't think they belong in the worst category. Yeah, not ideal.
Farmer Fred 37:21
Next on their “worst” list is something I have had first hand experience with, I was using it for pathways, not as a garden mulch. It is decomposed granite, DG, as it's known, It is made of fine crushed granite. It's a common material in many waterwise landscapes and native plant gardens. While attractive, its installation typically requires compacting and or grading the soil. At our place, to construct the pathway, they brought in this big machine that tamps the soil down, putting a lot of weight to get it down there. It provides poor soil conditions for new trees. Since it's made of rock it increases summer soil temperatures. And unlike organic materials, like woodchips, it provides no soil nutrition as it breaks down. Have you ever tripped on a DG pathway?
Debbie Flower 38:08
No. but I bet you I had skin knees
Farmer Fred 38:11
Or a twisted ankle or something like that, because if you're walking along a DG pathway, a decomposed granite pathway. And if you have gophers in your yard, they don't mind digging through that and you don't see it. Because it's like camouflage. Then all of a sudden, you step forward and your foot goes down another six inches or so. So you could easily injure yourself. So I would say if you have gophers, I would avoid decomposed granite in any situation where people are going to walk. Another thing that they might do with a decomposed granite is add a stabilizer to it to bind the material together to form a more concrete like surface. Well, no water is going to reach a tree that way.
Debbie Flower 38:53
For a pathway is fine but not as the mulch under a tree.
Farmer Fred 38:58
And again, if you are designing a pathway through your garden, especially through a tree and shrub lined area, I'd really try to keep trees and shrubs from that pathway by at least 15 feet or so maybe that's too much. Maybe not. Because eventually roots will find that area and they will come up the surface.
Debbie Flower 39:20
Yeah, well roots grow where there's oxygen and water. So if that is preventing oxygen and water from getting into the soil, the roots aren't going to grow in that soil.
Farmer Fred 39:30
And the absolute worst mulch to use, according to the Sacramento Tree Foundation - and I certainly don't have any disagreements with that - is rubber mulch. Do they still sell rubber mulch?
Debbie Flower 39:42
I have not seen it. I use arborist chips so I'm not mulch shopping much.
Farmer Fred 39:47
Recycled tires as mulch is not a good idea. It provides no soil building benefits. It heats up root zones and besides, what's in a recycled tire?
Debbie Flower 39:56
Good question. Yeah. You know if you fall on it you probably get blackened clothing. There was when I was in graduate school, which is was in the early 90s, there must have been money coming from the rubber industry or the landfill industry or somebody wanted to get rid of tires, because the professor's all had some money to study tires, as mulch. Tires as an amendment in container soil. Some way to use up tires. I think at that time they decided not to, in the Horticulture Department, but it was a good addition to tar when they're redoing roads.
Farmer Fred 40:29
Yeah. Or for whatever reason, as a base for playgrounds.
Debbie Flower 40:34
I don't want my kids playing in a playground like that.
Farmer Fred 40:38
No, no, there's metal shards in tires.
Debbie Flower 40:41
Yes, that's true.
Farmer Fred 40:43
So I'm thinking that rubber has fallen out of favor.
Debbie Flower 40:47
I think you're right. I think it had its moment and it's gone. Yeah. All right.
Farmer Fred 40:50
Well, there you go. How do you like that for an answer, Patty? Yeah, just move the mulch aside in your garden if you want to plant seeds, and then you can move that mulch back closer, when those plants are up and bigger than the mulch. That was the short answer. We gave you the long answer.
Debbie Flower 41:04
Yes, we did.
Farmer Fred 41:05
All right. Thank you, Debbie.
Debbie Flower
You're welcome, Fred.
SMART POTS
Farmer Fred
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DAVE WILSON NURSERY
Farmer Fred
You have a small yard and you think you don't have the room for fruit trees? Well, maybe you better think again. Because Dave Wilson Nursery wants to show you how to grow great tasting fruits: peaches, apples, pluots, and nut trees. Plus, they have potted fruits, such as blueberries, blackberries, raspberries, boysenberries, figs, grapes, hops, kiwifruit, olives and pomegranates. All plants, that you can grow in small areas. You could even grow many of them in containers on patios, as well. It's called backyard orchard culture. And you can get step by step information via their You Tube videos. Where do you find those? Just go to dave wilson dot com, click on the Home Garden tab at the top of the page. Also in that home garden tab, you’ll find a link to their fruit and nut harvest chart, so you can be picking delicious, healthy fruits from your own yard from May to December here in USDA Zone 9. Also in that home garden tab? You're going to find the closest nursery to you that carries Dave Wilson's quality fruit trees. They are in nurseries from coast to coast. So start the backyard orchard of your dreams at DaveWilson.com.
FALL WORM BIN CARE
Farmer Fred
We are at the Fair Oaks Horticulture Center during a work day we're talking with Susan Muckey, Sacramento County Master Gardener. She's in charge of composting and vermiculture here in the back of the Fair Oaks Horticulture Center. I asked her, “as you go from summer to fall, are there certain things we should be doing with our worm bins and our worms?” And she said, “Oh, I let the worms tell me what they need.” Well, that bears further study, doesn't it? Yes, indeed. So here's the Worm Whisperer, Susan Muckey. And she's going to translate for us. What do the worms tell you?
Susan Muckey 44:55
They're kind of like people. When it's 60 degrees, you might wear a t shirt and shorts, when it's 80 degrees, you might wear a sleeveless t shirt and shorter shorts. When it's 40 degrees, you might wear a pair of pants and a long sleeve shirt. This could occur in early fall. And so you kind of want to just see what the weather is like. Now, as it gets hotter and hotter in our Septembers, we need to make sure that our worm bins have enough moisture. And you need to make sure that they are being fed enough, because as it's warmer, worms are much more active. And so they eat more, they produce babies more. As it gets colder, they kind of slow down, sort of like us. And so when it comes to October, you're going to notice you don't need to keep them wet as much, you don't need to feed them as much, you kind of maybe want to throw a towel in there to keep them warmer. Now, think about throwing a towel in there. If it's a totally cotton towel, don't expect it back. Because they will eat it. I did that one year. I said, “Oh, I'm gonna be really nice to my words, I'm gonna throw some old towels in there.” Next time we went out there, they'd eaten the whole thing. I picked it up, and I could see through it.
Farmer Fred 46:27
They just gnawed through it?
Susan Muckey 46:29
Well, basically, in towels, and a lot of cotton products, there's this sizing, and it's made out of polyester. And that's what they do not eat. the polyester. It is the same thing with produce stickers. Produce stickers, they will not eat, they kind of tell you what they're going to eat, what they're not going to eat. Now, some of my colleagues say, “Oh, my worms don't like celery”, or “my worms don't like broccoli or cauliflower”. Well, they're not tough love worm mothers or fathers. Like us. We are tough love mothers and fathers, we just feed them everything. If they don't like it tough, they'll get around to it eventually. So they will tell you what they need in terms of temperature, it doesn't have anything to do with the seasons. In the wintertime, you're gonna notice they don't really do much. They're just trying to survive, they're usually down at the bottom of the bin. And there are a lot of times when they are just huddled together, because they're trying to keep warm, and they're just trying to basically survive. So the colder it gets, they're kind of like us in the wintertime. We kind of huddle together to to keep warm.
Farmer Fred 47:46
Temperatures for a worm bin. I guess between 50 and 70 (F) is ideal?
Susan Muckey 47:52
I would say between 40 and 80 (F). I mean it it depends on the person too, because I'd say there, they're kind of like us. Well, my husband likes it between 70 and 100. I like it more between 60 and 80. But the worms are comfortable and functioning between 40 and 80. Once it gets hotter than that, you know, you really want to be mindful if you've got your worm bin outside, you don't want it in sun exposure. You might want to put it under a porch. I keep mine in my barn. And so the temperature is usually cooler in there in the summertime and warmer in the wintertime.
Farmer Fred 48:38
You mentioned the woman who had trouble getting her worms to eat broccoli and celery. And yes, one solution is tell them that you're sitting here at the dining room table until you finish. But you gave us a tip a while back that really, really works. And I'm so glad I invested $20 in a cheap Hamilton Beach food processor to take all our unused produce and really make a soup out of it, or a Pico de Gallo, if you will. And they really love that.
Susan Muckey 49:03
Yes, worms don't have teeth. And so in order for them to access it, they kind of suck the goo into their mouth. like a straw, think of a straw. And so what they like best is the gooey stuff that's in the back of your refrigerator that you forgot to clean it out for a while. And so by blending it up, you're speeding up the process of decomposition, you're breaking down the fibers. Another way to do that without spending $20 for a food processor is to put it in the freezer, because that tends to break things down too. Now the problem with putting your worms scraps in the freezer is be sure to label them carefully. Because I have actually taken them out for dinner and found out that it's actually worm food.
Farmer Fred 49:55
How did it taste?
Susan Muckey 49:58
It went to the worms.
Farmer Fred 50:00
I should point out, it wasn't a blender I bought. That $20 thing was a food processor, about one cup food processor. So it's a lot of food processing going on there. But it's amazing how quickly all that food disappeared.
Susan Muckey 50:14
yes. And certain foods also will disappear faster than broccoli and cauliflower. Those are kind of more complex, say, then sugary foods, such as melons, cantaloupe, watermelon, that kind of thing. The worms are a lot like children, they like their sweets. And those things are less complex than say, broccoli, or Brussel sprouts. And so that breaks down a lot quicker. A lot of times when you throw cantaloupe in there, all you'll find in a couple of days is just the netting. That's kind of fun.
Farmer Fred 50:50
You gave me an idea what to do with my spoiled raspberries.
Susan Muckey 50:53
Oh, yeah, they'll love it, I put my figs in there. Figs that I didn't quite get to soon enough. They really love it, they're very happy. Another thing when you're worried about how much moisture is in your worm bin, you can overkill your worms with love, especially moisture, and too much food. So you have to be really careful and mindful of how quickly they're eating things up. So in the wintertime, you want to make sure the bedding is moist, but you also want to make sure that the food is disappearing. And if you've got too much food in there, you're gonna create a lot of too much moisture in there. And they'll probably die.
Farmer Fred 51:37
Having a drain on a worm bin, too, is a very good idea.
Susan Muckey
Yes, you if you don't have holes in the bottom of your worm bin, run to your drill right now and put them in there. Because there really does need a place for that excess moisture to go.
Farmer Fred 51:52
What do you put under your worm bin?
Susan Muckey 51:55
you can put a tray. If it's outside, you can put bricks underneath it. So the moisture would just sort of run into the soil.
Farmer Fred 52:03
What season is it best, or when do the worms tell you, “give me my own new worm bin, there's too many of us in here.”
Susan Muckey 52:11
It's kind of like that sourdough starter. When you start seeing too many and they will overpopulate if they're happy. I mean, you can always tell a happy worm bin if there's a ton of worms. And you can just be a good friend to your friends and neighbors and give them a cup of worms. They will really appreciate it. My worm bins are always really, really big. And so I've never really had that problem. I have four worm bins, so I just redistribute as needed.
Farmer Fred 52:41
And of course that product that's at the bottom of the bin is worm castings, a great soil amendment.
Susan Muckey 52:46
Oh yeah, it's excellent. When the food goes through the worm, it comes out into this most glorious nutrient. And we can't really say it's a fertilizer because none of the the N-P-K (Nitrogen, Phosphorus, Potassium) is high enough measurably to call it a fertilizer, but the soil and the plants just love it. It's sort of a reciprocal agreement between the plants and the soil when you put that worm compost in there and helps feed the plants. It helps transport things to the soil and to the roots. It's miracle stuff.
Farmer Fred 53:23
It's full of microbial activity.
Susan Muckey 53:24
Do you know offhand how many thousands of microbes are in a teaspoon? No, I don't either. I only remember stuff I absolutely need.
Farmer Fred 53:36
All right. So with worms, it's interesting that they're so easy to care for, but you do have to go in there and check them a couple times a week.
Susan Muckey 53:46
I probably do that once a week. I'm a sort of a tough love Mother. It depends, too, on the season. In the wintertime, I have a lot of citrus. And citrus is one of the things you absolutely do not want to put in your worm bin. I do put it in my regular compost. Some people don't put it in their compost, but I do because I'm a slow composter so I don't care if it takes a while for them to break down. But there's a material or the rind, there's an oil around the citrus, and it's toxic to worms’ bodies. And so you really don't want them exposed to that because if you put too many in there, that would kill them.
Farmer Fred 54:33
I'm sure at this point a lot of people are asking, “what else besides citrus should I not feed my worms?”
Susan Muckey 54:38
I do not put garlic, I do not put onions, and I do not put pineapple in there. Now, like I said, a lot of my colleagues are a lot more particular about what they feed their worms because they said, “my worms don't like this”. But those are things that you don't want to feed your worms because of the acidity and maybe the pungency, I don't know. Maybe they don't want garlic on their breath. I don't know.
Farmer Fred 55:06
I too, would think you'd want to avoid oils or foods coated in oil.
Susan Muckey 55:10
That's right. Now with our new compost program that the state of California has initiated, we have an organic bin, which used to be our green waste bin. And we can put anything in there that's organic, that was originally organic. But in a worm bin, you don't want to put anything in that's dairy. You don't want to put any cheeses, any oily things, anything like that. That would be rancid. They don't break down very quickly.
Farmer Fred
So no processed foods?
Susan Muckey
No processed foods, right.
Farmer Fred 55:45
Wow, that's a lot of good worm information, as you transition from summer to fall. Tips for growing worms year round, so you can harvest those worm castings and add it to your garden soil. Susan Muckey is a Master Gardener here in Sacramento County, and a worm expert, obviously. Susan, I’ll be looking for you on the bike trail.
Susan Muckey 56:00
Thanks. I'll try and see you there one of these days.
BEYOND THE GARDEN BASICS NEWSLETTER
Farmer Fred 56:07
In the September 22, 2023 edition of the Beyond the Garden Basics newsletter and podcast, we talk about fast food. Healthy fast food. Nutrient rich fast food - healthy greens - that you can grow in your garden or well-lit kitchen, and harvest them within 20 days of planting seeds. Yes, we are talking with experts about growing microgreens and baby greens. And we present proof that those tiny plants can be more nutritious than their full grown counterparts.
If you are already a Beyond the Garden Basics newsletter subscriber, it’s probably in your email, waiting for you right now. Or, you can start a subscription, it’s free! Find the link to the Beyond the Garden Basics newsletter and podcast in today’s show notes, or on the Substack app. Or, you can sign up at the newsletter link at our homepage, gardenbasics dot net.
FLASHBACK EPISODE OF THE WEEK: TEAMING WITH MICROBES #238
Farmer Fred
If you listened to this podcast for any length of time, you’ve probably figured that a successful garden begins with successful soil. And nature provides just about every thing you need for successful soil. And that includes the soil microbes that are responsible for getting that soil’s nutrition to your plants. The current Flashback Episode of the Week, is “Teaming with Bacteria”, a conversation, a fairly wonky conversation, about soil bacteria with garden columnist and book author Jeff Lowenfels. And our favorite retired college horticulture professor, Debbie Flower, was part of that chat, as well. She was in soil nerd heaven. And apparently, so were a lot of you above-average, science-loving gardeners because that episode had a lot more than the average number of listeners to the Garden Basics podcast.
Give it a listen, episode 238, from November of 2022: “Teaming with Bacteria.” Find a link to it in today’s show notes, or at the podcast player of your choice. And you can find it at our home page, garden basics dot net.
Farmer Fred
The Garden Basics With Farmer Fred podcast comes out once a week, on Fridays. Plus the newsletter podcast, that comes with the Beyond the Garden Basics newsletter, continues, also released on Fridays. Both are free and are brought to you by Smart Pots and Dave Wilson Nursery. The Garden Basics podcast is available wherever podcasts are handed out, and that includes our home page, Garden Basics dot net. , where you can also sign up for the Beyond the Garden Basics newsletter and podcast. That’s Garden Basics dot net. or use the links in today’s show notes. And thank you so much for listening.
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