Often found in specialty stores and gourmet restaurants, Portabella mushrooms can be easily grown - no green thumb required! This mushroom kit consistently grows large portabella size mushrooms with little to no effort. In a few weeks, you can harvest fresh mushrooms perfect for grilling, roasting, and sautéing. Approximately 4 pounds of mushrooms grow during a 2-3 month period of time. Mushroom Growing Kit contains inoculated mushroom compost, casings, and instructions. All you add is water!