A complete grain-and-substrate grow bag in one self-contained unit, ready to use as soon as it arrives. Simply inject your spawn through the injection port and let colonisation happen inside the bag - no separate spawning or bulk substrate steps needed.
 
Each bag combines sterilised grain spawn with a nutrient-rich bulk layer, sealed with a breathable filter patch for gas exchange. Once fully colonised, cut an X in the bag to fruit directly, or dump and hold into your own tub.
 
Available in 1lb, 2lb, 4lb and 6lb sizes. Ideal for anyone who wants a low-equipment way to grow gourmet mushrooms at home.