We have a number of large piles of rotted wood chips on our land from about five years old when we had to clear a few trees. They produced quite a few two years ago, then nothing last year with the dry fall in our area. We're happy to see them again.
Psilocybe cubensis are much more resilient than people give them credit for and are really easy to grow. UB tek is great if you don't want to mess around with pressure sterilization or anything like that.