I admit to being skeptical of the sites on the inter webs that claim you can grow mushrooms from stems on moist cardboard, but I will kiss your butt on Twentieth Street in Birmingham if they’re not right. Those white furry things you see are mycelium, which are the mushroom equivalent of roots–only they grow incredibly fast. In fact, oyster mushrooms will feed on almost any kind of cellulose, including cardboard.
Being of an experimental nature, and having a workshop full of hardwood sawdust, I decided to try this. The base of this mixture is about three fourths of a cup of sawdust. On top of that is a layer of Amazon box cardboard. Then there are two clumps of King Blue Oyster mushroom bases, from the Oyster mushrooms that I recently grew. Both clumps cloned themselves, and when they hit the sawdust, it was all she wrote.
Another moist layer of cardboard is on the top, and I fear that it is not aware of the death penalty that it faces. Mushrooms are more like animals than vegetables, and Oyster mushrooms are documented to have killed both nematodes and various bacteria, and then eat them. And then, all things made of wood are on the menu.
I did manage to kill off a sourdough starter that I nursed for more than a decade, but that was just negligence. As we both love fresh mushrooms, I think these are keepers. So there it is–$13.99 for a lifetime supply of mushrooms, plus some ingredients that would have ended up in the compost bin.