Building Garden Soil With Wood Mulch

In the short term (two years), wood mulch can potentially lower soil fertility, but in the long term their value in building garden soil is beyond question.
By Barbara Pleasant
October/November 2010
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By providing food for fungi, wood mulch builds garden soil by increasing levels of organic matter in your garden beds.
ILLUSTRATION: ELAYNE SEARS
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Most organic gardeners find that following nature’s patterns serves them well. When it comes to building richer soil, nature’s plan relies heavily on trees — fallen limbs, leaves, cones, seeds and, eventually, the massive trunks. Adapting this plan for building garden soil by using a wood mulch — such as wood chips, sawdust or other woody residues — is a strategy that promises huge, long-term returns.

Field studies dating back to the 1950s — and as recent as this year — suggest that a high-fiber diet of woody materials is exactly what many soils need. Rotted bits of wood persist as organic matter for a long time, enhancing the soil’s ability to retain nutrients and moisture, which results in bigger, better crops.

But wait: Woody materials are high in carbon and cellulose, so they need nitrogen and time in order to decompose. If you ignore these facts by mixing fresh sawdust or wood chips directly into your soil, the materials will bind up much of the soil’s nitrogen and render the spot useless for gardening for a season or two.

The outcome changes, however, if you add nitrogen or time. For example, when researchers planted a new organic apple orchard in northern Maine in 2005, fresh wood chips combined with blood meal (a very high-nitrogen organic material with a typical analysis of 12-0-0) and tilled into the top layer of the soil — plus a surface mulch of wood chips — proved better than three other treatments at promoting rapid tree growth. And, in less than two years, the organic matter content in the chip-amended plots went from near zero to 2 to 3 percent.

Sawdust has much more exposed surface area than wood chips do, so incorporating fresh sawdust into soil is not a good idea chemically (because of nitrogen tie-up) or physically (the mixture won’t hold water worth a flip). But sawdust makes a spectacular mulch for perennial crops. As long as you scatter a bit of organic fertilizer, poultry manure, or other nitrogen source over the surface each time you throw on a fresh layer, sawdust makes unsurpassed mulch for blueberries, strawberries, and raspberries, and it can work well with asparagus, too.

Garden paths paved with sawdust-covered newspapers feel like carpet underfoot. After it has rotted, sawdust contributes mightily to soil’s texture, because the spongy tidbits persist in the soil for a long time. The concern that woody amendments acidify soil is a myth. Only in the early stages of decomposition is there a fast flush of acids, when cellulose fibers begin to degrade. Long-term studies of the effects of wood chips and sawdust in soil actually show a slight rise in soil pH, which is good news for most crops in most gardens. (The lower the pH, the more acidic the soil.)

Mycelium Madness

In the Maine apple orchard study, the research team observed that the wood chip plots became covered with white mycelium, which is the vegetative form of many fruiting fungi and is commonly known as white rot. The development of these fungi in the wood mulch increases the amount and enhances the character of organic matter in the soil, as well as helps the soil’s ability to retain moisture. The huge group of fungi known collectively as Basidiomycetes is a core player in wood chip decomposition. Many produce mushrooms — pretty, but not generally edible. Where moist wood chips and soil unite, these fungi use enzymes to access nutrients in the wood, which is their energy source for the growth of threadlike, white hyphae. The hyphae knit themselves together into mycelium, which is easy to see. In addition to fungi, several specialized types of bacteria are able to degrade high-cellulose materials such as wood chips, while others digest failing fungi. Seen this way, it’s easy to envision wood chips in soil as life rafts that support three major levels of soil life: the fibrous organic matter of the chips themselves, the biological mass of filamentous fungi that grows on them, and beneficial bacteria that come and go in waves.

Starter colonies of these microorganisms are usually present on the bark of chipped branches. Tradd Cotter, mycologist and owner of Mushroom Mountain in South Carolina, says fungi present on wood start growing quickly after wood has been cut or chipped. In moist climates, there may be no need to add a fungal inoculant to kick-start the process, but Cotter says providing inoculants in the form of sawdust spawn (sawdust covered with actively growing mycelium) can speed and enhance the soil creation process. Maybe you’ll get some edible mushrooms in the process, too. “The native edible species king stropharia (Stropharia rugoso-annulata) is by far our best wood-decomposing strain,” Cotter says. “It is spreading through our gardens, increasing soil depth, and attracting beneficials, such as earthworms.” Sawdust or wood chip spawn of stropharia (winecaps) and other species are available from Mushroom Mountain, Field and Forest Products and Fungi Perfecti.

Recovering Resources

Wood chips and sawdust are each byproducts of other activities, so finding good-quality, local resources is your first step. If you live near a sawmill, you can probably get sawdust cheap, though you’ll need assurance from the sawmill operator that it doesn’t include black walnut sawdust, which releases a toxin that can be murder on tomatoes and other sensitive vegetables. Also avoid sawdust from plywood and painted or treated wood in your garden because of the glues and other chemicals. With sawdust, the lower you go on the production chain (a sawmill that handles whole logs), the more likely you are to get garden-worthy sawdust. For soil-building purposes, coarse sawdust is better than fine because it’s less likely to pack into a mat, and it lasts longer as organic matter in the soil.

If kept moist, sawdust can decompose surprisingly quickly. In a study at Ohio State University, sawdust rotted faster than newspaper or straw, both of which were still recognizable after 16 weeks. To speed up rotting in a pile of sawdust, simply add moisture and nitrogen. This can be done by mixing up a big batch of fish emulsion, pouring it into an already damp, doughnut-shaped sawdust pile, and then covering it with a tarp or an old blanket to retain moisture. After sawdust turns black, you can use it to lighten up any soil — including potting soil — for seedlings and container gardening.

Most of the more recent studies with wood chips used what are called ramial wood chips, which are what you get when you put live, leafless hardwood branches, 2 to 3 inches in diameter, through a chipper to create pieces that are a half to 1 inch wide and 1 to 4 inches long. Ramial chips have relatively little bark and heartwood because of the size of the branches used, which is part of what makes them so attractive as a soil amendment. Superior batches also contain few leaves, cones, or other prickly parts. 

You can get ramial wood chips for free by connecting with tree-trimming crews working in your area. In some towns, such as Oshkosh, Wis., you can take small limbs to a chipping center on certain Saturdays and go home with your own homegrown wood chips. Wherever you live, a few phone calls to local utility companies or tree service companies should be all it takes to find a free supply. Wood chips often end up in landfills; let’s put them to use enriching our garden soils instead. 


Chipper-Shredder Options

If you have lots of trees to tend on your property, you may want to buy a chipper-shredder and make your own soil-building mulches. You could use the machine to shred fall leaves, too. If a storm brings a tree down, you can rent a chipper, or hire someone to come in and chip it up for you. Companies that make chipper-shredders include BCSCountry HomeEcho and MacKissic.


Contributing editor Barbara Pleasant gardens in southwest Virginia, where she grows vegetables, herbs, fruits, flowers and a few lucky chickens. Contact Barbara by visiting her website or finding her on .


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Post a comment below.

 

maine
6/17/2014 5:22:03 PM
have wood chips...if not growing veggies, do I have to add anything before putting chips down ? also, have peat moss and don not know what to do with it !

AnnM
5/6/2014 2:07:11 PM
Last year i bought new organic dirt and it seemed more like mulch than soil - the plants did very poorly. I amptied out my container this year and bought new dirt and it looks the same - more like mulch than soil. Am I wasting my time - I can't see inside the bag before I purchase them.

Deb Duis
4/19/2013 8:41:56 PM
Use gypsum to alter the structure of clay soil. Gypsum flocculates the clay particles creating air pockets between, and allowing roots to breathe. Add some topsoil into the hole when you plant, and a small amount of fertilizer (according to plant size).

Deb Duis
4/19/2013 8:36:26 PM
Never ever use fresh wood by-products in your garden! Break them down first, because they will rob the soil of nutrients in order to compete their breaking-down process. If you must use them, then dust them with lime to speed up the process.

Eric Markov
11/2/2012 10:05:19 PM
I dug in wood chips into heavy clay soil that I hadn't been able to grow anything in before. Fertilized with human liquid fertilizer and good a great harvest. Later I dug up the soil to check what the roots were doing. The roots all massed in places with lots of wood chips. In parts of the soil w/o chips the roots didn't grow. Interesting pictures at: http://lowcostvegetablegarden.blogspot.com/2012/10/wood-chip-soil-pictures.html

Atlanta TreeProfessionals
10/4/2012 4:41:19 AM
Great post. Here in Atlanta as a tree removal company we offer free wood chips to anyone. All they have to do is call us. Gardeners and those who landscape love it and so do we. It's the ecofriendly solution instead of putting into the waste stream.

Shaun Bryant
12/6/2010 5:46:07 AM
Does Red Cedar chips make good compost? I heard somewhere its not.

Chris West
11/10/2010 9:52:17 PM
I have the good luck of living in a semi rural area with 2 tree trimming companies on my street. They are very happy to drop truckloads of ramial chips on my driveway for use in the garden. I only use them in the walkways though, for my raised beds I have composted forest products from approved sources trucked in. Not free but worth it. The only problem I am having with the ramial chips is with bermuda grass. It loves the cover the chips provide and is now overtaking the walkways and surrounding fruit tree areas. I don't want to blast Round Up on anything in my garden and horticultural vinegar is both expensive and short acting. Anyone got any suggestions on how to eliminate it? It manages to keep getting into my beds creating a real nuisance. Thanks and happy gardening!








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