Substrate is organic matter that serves as food for the spawn. In nature, mushrooms grow naturally in soil, manure, decaying leaves, and downed tress. Substrate can be made from any organic materials containing carbohydrate and nitrogen. Typical substrate materials include cardboard, coffee grounds, wood chips, straw, and compost. Although at Circular Farm, we use organic soybean hulls and sawdust which is a byproduct of the logging industry.
At this time, please contact us to purchase your sterilized substrate.