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I have read in various places that mushrooms in lawns are an indication of woody compostable material that is being eaten by the mushrooms and that the by-product of this process will be additional nutrients for the lawn.

Can this same process be used in a vegetable garden? @bstpierre mentioned that mushrooms would compete well against the vegetable plants for the nitrogen in the soil in this question. But if there is a lot of uncomposted material from the previous season (stems, roots, leaves, etc) lying on top of the garden (left there as mulch/soil amendment) can a balance be struck with mushrooms mostly feeding on the mulch and the plants eating the nitrogen in the soil? What species of mushrooms would be good for this? It would be nice if the mushrooms were edible.

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Om Patange
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2 Answers2

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Mushrooms like feeding on decomposing organic material under the surface of the ground that rarely gets disturbed, or above the ground in large pieces that are constantly internally moist. They like rich soil in shady locations. Of course this is your average mushroom. There are kinds that use different growing environments. But the point is that in a vegetable garden, the conditions are all wrong. A better idea would be to compost the material. The bacteria and fungi do the same thing as the mushrooms, but are by far easier to use than mushrooms. When you see mushrooms in your lawn, it means you have undecomposed organic material in the soil. The mushrooms have probably been working on them for a while before you saw the fruiting bodies emerge. Getting the mushrooms with a lawnmower will not hinder the composting process from continuing. And even if there were no mushrooms, little microscopic organisms would be eating it.

J. Musser
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Companion cropping vegetables with mushrooms is not that uncommon. One pair that I've implemented with success is asparagus with King Strophoria, or winecap, mushrooms. This video illustrates the practice. This mushroom can be paired with any crop that will provide moderate shade throughout the growing season.

I wouldn't be too concerned about competition for nitrogen (N) as typically fungi of this sort tend to do best in low N situations - they are able to decompose materials with significantly higher C:N ratios that bacteria. If there's enough N, bacteria and molds tend to out-compete the desired mushroom species.

The benefits of growing mushrooms amongst your vegetables include:

  1. Maximize production in limited space
  2. addition of organic matter to the soil as straw is decomposed
  3. Yummy mushrooms for breakfast
  4. presence of desired fungi can prevent undesirable soil fungi from establishing
  5. Straw on soil will help hold moisture and even out water availability
  6. Winecap mycelia have been shown to kill nematodes
That Idiot
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