Home-grown mushrooms have become popular with backyard gardeners over the years. Mushroom growing kits are available through some garden centers and online. There are several varieties available to home growers: shiitake, white button, oyster, reishi, maitake, and lion's mane are the most common. There are two classifications of preferred substrate (growing medium): compost and woody material. White button mushrooms prefer compost while the others prefer wood material such as a log.
Purchase mushroom kit with the variety of mushroom you have chosen. Start with one variety to become familiar with the process; white buttons are a good first choice. Make sure to order a kit that has prepared substrate included. You can create your own substrate, however, this can take weeks to prepare.
Fill a large baking pan with substrate. Spread the flush (mushroom spores) in a thin layer over the substrate. Cover the spores with a thin layer of worm casings, approximately ¼ inch.
Place the baking pan in a dark room on top of a heating pad (a top closet shelf with an outlet nearby works well). Set the heating pad to a low setting (you do not want to cook your spores). The worm casings will provide moisture for the spores. Mist with water using a small spray bottle to keep casings moist. Fruiting bodies (mushrooms) will begin to appear in three to four weeks.