Grow your own mushrooms! The Blue Oyster Mushroom (Pleurotus Ostreatus-columbinus) is a delicious gourmet mushroom, natural to European deciduous forests. Our hardwood fruiting blocks are innoculated and allowed to partially myceliate prior to shipping. Watch as the mycelium cultivate your block, then slice open the wrap to allow the mushrooms to grow. Pick and eat as they develop. Delicious, succulent, and perfectly fresh.