According to the Mushroom Appreciation group, there are over 10,000 known types of mushroom, with 300 being edible. To minimize the risk of mushroom growing mistakes, it’s ok to start with something low maintenance, hardy and quick-growing. Oyster mushrooms (Pleurotus ostreatus) come in a range of shapes and colors and are especially easy growing and productive in a range of substrates like compost, coffee grounds, paper, sawdust blocks and eco-straw bales.