Aged bark fines, straw, composted animal manure, gypsum
Garden Valley Mushroom Compost is an organic based compost mix. It is made with a blend of Canadian sphagnum peat moss, horse and chicken manure with other organic based ingredients and minerals. Use Mushroom Compost when an organic based mix is desired, particularly in raised bed gardens where the soil needs to be light and loose. Made in-house in Eugene, Oregon.