sources for leaf mulch/mold in southern california? And a whine...
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4 years ago
last modified: 4 years ago
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Fresh Wood Chip Mulch
Comments (78)Seems to me that wood should be one of the sources of organic matter that is applied to soil. Wood is partly made of long-lasting organic molecules (lignins) that serve as food for mycorrhizal fungi. I add wood chips to my compost piles when I can, and I almost always can. How well wood chips works as a mulch and soil amendment depends upon a lot of factors. What kinds of trees were the source of the chips? How small are the chips? How much leaf and small twig is in the waste? How fresh are the chips? What is the climate where they will be used? Does the soil beneath the wood chips have lots of organic matter in it already, and what kind of OM is in the soil (decomposed wood, fresh compost, aged compost?) From what I read here, it seems like wood chips work well in hot, humid environments, almost regardless of other factors. They also seem to work well when their use is ongoing, where there has been wood mulch in place for years. Fresh, small wood chips that contains lots of twigs and fresh leaves composts very hot and seems like an ideal mulch to suppress weeds. Just like compost piles, fresh chips benefit from being in a pile where the vapors, both water and ammonia, can be reabsorbed by the pile. I'd even suggest covering the pile while it is at its hottest. Covering the pile will slow the loss of water and ammonia and speed its decomposition. I'm thinking of a four-layer method of creating new garden beds. Starting in the fall, on the bare soil, apply some of the humic shale ore like Zamzow's Huma Green. Maybe scratch it into the very top of the soil. Then lay on four inches of finished compost. Then several inches of unfinished compost, and finally a mulch of wood chips that have had a chance to decompose for a bit. I think there would be a good interaction between the unfinished compost and the wood chips. By spring the finished compost will be integrated with the topsoil, and the layers above might be a perfect mulch. Dig through it to plant your plants, perhaps keeping it away from the plant stems until the plants are established and the weather warms up. The wood chips will protect the layers underneath and eventually become part of the compost....See MoreList of Mulches - which one is best?
Comments (20)I'd avoid any mulch made from whole trees ground down for mulch. That's the problem with the cypress, the swamps are being logged specifically to grind the trees into mulch. I was just reading about Louisiana allowing private landowners to clearcut their cypress stands at the same time the state is asking for billions of federal tax dollars to restore wetlands. It's positively insane; cypress swamps are known to protect against storms surges and presumably would be some of what would be restored at great expense to us federal taxpayers, while private landowners are profiting from creating the problem. But, any other wood mulch created from whole trees will be just as bad, like the cedar listed. Why cut down a perfectly good tree just to make mulch out of it?? Mulches created from mill waste are fine; mulches from ground up trimmings are fine; mulches from bark are fine so long as the tree was being cut primarily for the wood and the bark is a byproduct. What species of tree will be best depends on what grows locally. Cypress mulch might be fine if you live right next to a cypress mill. I live in Doug-fir and western hemlock territory, so that's what I get. In California, redwood bark and eucalyptus mulch are readily available, but it would be silly to ship them elsewhere. Texas has lots of oak and pine, which we don't have here. Texas should have lots of local pecans too I would think. If I lived in pecan growing territory, I'd use it. I used to live in California, and I used mulches made from rice hulls as it's one of the major crops in NorCal, and makes a good cheap mulch. As far as helping the soil, you want something that will break down and add organic matter - compost, leaf mold, tree trimmings. Barks and woods don't really add much, they're used where people don't want it breaking down....See MoreMulch & powdery mildew
Comments (44)It appears that the reference that I gave about the problems of wood mulches and the advantage of compost could use some backing up by more primary scientific material. The link below is to an Ohio State University Extension Fact Sheet, Plant Pathology, 2021 Coffey Road, Columbus, Ohio 43210 Title: "Control of Nuisance and Detrimental Molds (Fungi) in Mulches and Composts" Please note the following and put in context of the full article (also note the appearance of statements such as "These bacteria compete with fungi to reduce the potential for the development of major mold problems.") "The best way to avoid all these problems and bring about beneficial effects by mulching is to add nitrogen to woody and hardwood bark products followed by composting to lower the carbon to nitrogen ratio. Blending of grass clippings with wood wastes before composting is one way to achieve this. Addition of poultry manure or urea to supply 1.2 lbs. available nitrogen per cubic yard of material satisfies the nitrogen need also. Some landscapers add 10-15% by volume composted sewage sludge to hardwood bark or wood wastes, and this makes an ideal product that has performed very well in landscapes. These amended products should be composted at least six weeks. This process kills plant pathogens, eggs of insect pests, and produces a nitrified product that releases plant nutrients rather than ties up nitrogen. As mentioned above, the microorganisms that have colonized these products reduce the potential for growth of nuisance fungi and provide control of many plant diseases" "What to Do Once the Problems Occur Sometimes very little can be done to control nuisance fungi other than to spade the mulch into the surface soil layer followed by soaking with water. Another option is to remove the mulch, place it in a heap after thorough wetting to allow for self-heating to occur (110-140 degrees F). This will kill nuisance fungi. If fresh dry mulch is placed on top of mulch colonized by nuisance fungi, the problems may occur again the following year or even earlier. The best control strategy for homeowners and landscapers is to purchase composted products low in wood content. Fresh, finely ground woody products should be avoided for many reasons unless composted first. Coarse fresh woody products are much less likely to cause problems unless applied too deep. It is important to soak all mulches immediately after they have been applied. Generally, mulches should not be applied to a depth greater than two inches. Mulches and composts applied in this manner provide many types of beneficial effects rather than nuisance problems, or worse, plant diseases. Sour mulches should be avoided altogether." Here is a link that might be useful: link for above...See MoreBest mulch for roses
Comments (17)I practice a two-layer approach. In the spring after pruning I scatter an organic fertilizer, often using alfalfa meal. I usually do not fertilize again (except in my vegetable garden). Then the first layer goes down. Each year I alternate, one year using composted city yard waste, the next year a high quality composted stable manure available nearby. If I lived in a higher rainfall area, I would use the stable manure every year, but I don't want the salts to build up in my soil. On top of the compost goes a mulch of mixed tree trimmings. As Berndoodle mentioned, it is large and coarse. However, much of it breaks down over a year or two. The remnants of the previous year can easily be raked aside to put down the compost, then replaced on top. The purpose of the mulch is to preserve water, moderate temperature, shade out weeds, and very importantly to protect the compost. It breaks down slowly and eventually improves the texture of the soil. Once upon a time there was a lot of concern that wood-based mulches would rob the soil by tying up nitrogen as it decomposed. It is now believed that this only happens at the contact layer so long as you don't mix it into the soil. Furthermore, by using wood material that includes greens (leaves), this is greatly reduced. I get my wood-based mulch free from a local tree-trimming service. You do have to take a truck load of you go this route, so it may be necessary to purchase it if your garden is small. Rosefolly...See Moregardengal48 (PNW Z8/9)
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