Coffee is an excellent "substrate" material to use for growing your own mushrooms. This is something with which I've had some tenantive success, when I worked in an office from which I could frequently nab bulk enough stocks of used coffee grounds on a daily basis. Now I work from home, my supply chain is limited again. So it goes
You need a decent amount of coffee grounds to mix with your sterilised cardboard, so while building up to that from my own supplies, I have to keep the stocks sterilised and mold free. I'm doing this inside a half-gallon mason jar to which I add my grounds each time they're ready (usually straight after I've had my coffee - no point leaving them exposed to the air any longer than that, as it only increases the risk of mold developing).
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