The Q&A Archives: mushroom compost

Question: I'm thinking about adding mushroom soil to my vegetable garden as a soil amendment and fertilizer. Is this a good idea?

Answer: According to John Hart, soil scientist with the Oregon State University Extension Service, Mushroom compost can supply nutrients and increase the water-holding capacity of the soil. But mushroom compost can be too much of a good thing for seeds, seedlings and young plants. The soluble salts and other nutrients in fresh, undiluted mushroom compost are too concentrated for germinating seeds, young plants and other salt-sensitive plants. To avoid killing germinating seeds and stressing young plants we recommend mixing mushroom compost with garden soil. Or, order a supply of mushroom compost in the fall and let it sit uncovered, to cure over the winter.

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