Yellow oyster mushroom cultivation set Pleurotus ostreatus — organicLook at them grow! Everything you need to grow organic yellow oyster mushrooms is in the cultivation set. These have a yellow, 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 propagator and place it in the sun so that it's in a warm place. After