May 16, 2024 · Mushroom compost is a by-product of the mushroom growing industry. It’s generally comprised of raw organic materials such as straw, hay, horse and poultry manures, cotton seed hulls, and corn cobs. Some mushroom composts may also contain peat moss, gypsum, soybean meal, and lime. Once the base ingredients are mixed up for the compost, it’s
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