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 7 years ago (edited) 

a little. I mix -2 Parts Vermiculite -1 Part Water -1 Part Brown Rice Flour in a glass jar, the pressure cook it for 60minutes. After the spores are injected, the jar must be kept in an area above 18C, but less than 30C. 100% humidity is optimal, but not required depending on mushroom type.

its called BRF tek. Or Brown rice flour technique.

But where do you plant it afterwards?

inside or outside... depends on the weather, they take about 2 months to grow to mushrooms most times (depending on type and location)

But it does not matter what kind of soil it is? Does it need trees to feed on or something? :)

depends on the type you are growing. some grow best from trees, but most can be grown from the BRF tek.