The Q&A Archives: mushroom soil

Question: can I plant my garden right in th emushroom soil?

Answer: You can plant directly into mushroom soil, but you can stretch your dollar by mixing the mushroom soil into regular garden soil. Commercial mushrooms grow in a specially formulated and processed compost made from wheat straw, hay, corn cobs, cotton seed hulls, gypsum and chicken manure. When the mushroom harvest if finished, farmers steam pasteurize everything in the growing room and dispose of the peat moss and compost that remain. This product is sold as mushroom soil, spent mushroom compost (SMC) or spent mushroom substrate (SMS). Mushroom soil is great for gardens as a slow release organic fertilizer (2-1-1, pH 6.8) when mixed into soil or as a mulch one year and a soil amendment the next.

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