On a
commercial note,
psilocybin mushrooms are generally grown in specially designed buildings that can be best likened to
clean rooms.
Unlike indoor hydrophonic cannabis farms, it is quite easy to disguise a mushroom farm, but the setup fee involved with such a structure is quite large.
Many of them are rumored to be in Northern California, and their exact locations are rarely known, except to a chosen few who deal specifically with exporters.