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Alder is great for woodlovers (especially when cut and chipped in the spring) because its full of sugars and fungii loves it. Generally people put down "beauty bark" which is mainly either ceder or doug fir BARK mulched up. Coniferous trees are long lived trees and their barks are filled with growth retarding tanins which Psilocybes cant handle. Basically i just described 2 ends of the spectrum, however most of the time your never gonna have pure alder woodchips available. If you have a mixture of alder, fir, ceder, cottonwood wood chips that will be fine for Psilocybe growth...even if theres a little bark in there youll be fine. Basically check WOOD debris and stay away from anything that is comprised of only "bark mulch" which is evil. Hope that helps..