Grey oyster mushroom cultivation set Pleurotus ostreatus — organicHave you always wanted to grow your own mushrooms? This cultivation set makes it a piece of cake! Everything you need to grow organic grey oyster mushrooms is in the set. These have a light grey, flat, fan shaped cap with soft white flesh. Growing for beginners! Growing yellow oyster mushrooms is simple! Make five slits measuring 23 cm in the plastic containing the substrate. Then pour 0. 25 litres of water into the substrate, place in the closed