I tried to make a moss garden under some birch trees and one spruce tree. I got some moss about 3 years ago. It was the type that is a few inches thick. It got filled with weeds. Virtually all of it has died. I started to dig it up to put in a different type of garden like flowers. When I dug it up, most of it was just filled with roots. Why all the roots. I have a book on moss garden by Schenker or something like that. It seems like something is missing. No one seems to really know how to propogate moss. Is it the pH, certain minerals, soil biology? I was on this forum a few years ago when I "planted" the moss. People did not have a real handle on it then. Is there reseach being done on this?