1.5 ft3 bag of our mushroom substrate, crushed up and ready to be used as a mulch or soil amendment. We use wood pellets made of 50% oak sawdust, and 50% soy hulls to grow our mushrooms on. After we harvest the mushrooms the blocks of mycelium and substrate are crushed up. Each bag may contain sterilized wheat berries, coco coir, some perlite, and roots from our microgreen operation. The contents are living, mainly comprised of the mycelium of the mushrooms we grow. Depending on the condition, you may get mushrooms growing in your yard after using this product. Most likely would be the pearl oyster or chestnut mushroom from our experience. This product is offered with free delivery in Walla Walla, College Place only.