Grow-it-Yourself Elm Oyster Mushroom Kit, a Gourmet Mushroom Gardening Treat Low-cost kit for growing gourmet mushrooms Produces a pound or more of rare Elm Oyster mushrooms Includes hardwood pellets and minerals; you add coffee grounds, hydrogen peroxide, and water Pinheads form in 3-6 weeks; harvest 1 week later Complete instructions included; 100% satisfaction guarantee