Mushroom Growing Kit - Rye Grain Spawn Bags Substrate + Monotub Grow Like MagicGrow your own dung loving mushrooms like magic with this high yield mushroom growing kit in a bag by FunGuy Grow Kits. Comes with our 100% Contam Free Guarantee. We guarantee your grow kit will arrive sterile and contaminate free or we will replace it free of charge. The kit contains high quality rye grain berries, and a fast growing dung loving substrate blend for large yields. With easy to follow instructions. Grow Dung Loving mushrooms in any room