Found some Agaricus bisporus (white mushrooms) with mycelium still clinging to the base of several stem/stalks. My question is, if I plant it, will it multiply? Could I start my own mycelium on cardboard, coffee grounds, or potting soil? The internet says compost is it's preferred food. Anyone have any experience with growing this kind of mushroom?
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Growing Agaricus bisporus from stem/stalk cuttings would be extremely difficult. In fact, growing this species from commercial spawn on compost is not easy either, I've had no luck. However, I've had great success growing Almond Agaricus (A. subrufescens) on leached cow manure compost in banana boxes with spawn from Field & Forest in Wisconsin. This species of Agaricus is delicious and is much easier to grow than A. bisporus. It also can be grown from stem cuttings propagated on cardboard like King Stropharia. Here's a video on how to grow Almond Agaricus outdoors or in a greenhouse: