Mushroom Compost

Mushroom compost, often referred to as “spent mushroom substrate” or “mushroom soil,” is a byproduct of the mushroom growing industry. This compost is made from a mixture of organic materials such as straw, peat, gypsum, and sometimes poultry manure, which have been used to grow mushrooms. Once the mushrooms have been harvested, the remaining substrate is sterilized or pasteurized to eliminate any harmful pathogens, insects, or weed seeds, making it safe for use in gardening and agriculture. This process creates a rich, organic compost that is high in nutrients and beneficial microorganisms. Mushroom compost has a neutral to slightly alkaline pH, typically ranging from 6.6 to 7.5, making it suitable for a wide range of plants. Its high organic matter content improves soil structure, enhancing water retention, aeration, and drainage. It also releases nutrients slowly, providing a long-lasting nutrient source for plants. Mushroom compost is versatile, being used for soil conditioning, mulching, and as a component in potting mixes.