Monster Mushroom Mini-Boomer Grow KitA small but mighty Mushroom Grow Kit! Build your confidence and have fun cultivating at home. The Mini Boomer Mushroom Grow kit is the perfect size to get you started. Included is a 1lb. bag of sterilized Super Spawn Grain and a 5lb. Super Shroom Final Fruiting substrate. Add your spores and experience the magic of growing mushrooms at home. The double tub makes it possible to colonize (lid on) and then have room for fruit (second tub inverted on top)