Not for beginners, you need up to 15kg coffee grounds
A specific strain of Oyster (Pleurotus ostreatus) to grow on coffee grounds. Spawn on wheat grain.
The kit contains 1.5kg Oyster wheat grain spawn, 10 spawn bags, 10T and 1.5kg chopped wheat straw
I like to add at least 10% spawn and 10% to 30% straw or cardboard to coffee grounds. The straw / cardboard helps aerate the mix.
Coffee beans are steam pressed to release the coffee, when fresh the grounds are virtually sterile but will quickly become contaminated with wild fungi, blue green molds. If getting grounds from a coffee shop use on the same day. If you are gathering enough for a batch, freeze the grounds each day to keep them fresh. Defrost and microwave to steam.
Mix coffee grounds and straw or cardboard, microwave to steam and cool to room temperature before adding the mushroom spawn.