With coffee as a substrate we have created a kit through which you can grow your own mushrooms without leaving home. It's easy, fun and sustainable. The kit contains a sealed bag of oyster mushroom mycelium incubated over coffee grounds. Just tear the window out of the box, make a cut in the bag, immerse it in water for 24 to 36 hours, put it back in the box and moisten the substrate daily. In a few days your first mushrooms will sprout. Once the crop is finished, the mushrooms turn the substrate into an excellent natural fertilizer that you can use in your pots or garden.