I just spread stropharia sawdust spawn randomly in my backyard compost pile, and it regularly fruits. The mycelium are everywhere in the pile, they have the whole thing colonized. It fruits in spring and summer whenever there is a rainy cold stretch followed by a couple warm days. I literally just dumped it in there 3-4 months ago. I dont do anything except put more kitchen compost on top regularly. The fruits, ive found are milder and better eating when at least 4-6" in diameter