Hi, David...Just yesterday I buried a couple spent logs from 2006 in a '
pie cherry' tree hole. I was able to bend them and break apart but there was no mycelium left that I could see although I assumed there was something good there for my soil. I think by the time the logs quit producing shiitakes on the surface of the log there is no mycelium in the log or only a bit. I am curious if you have some logs available or are intending to plug some? There are
fungi folks on these forums who know much more than I ...so we will hope that they will
answer your question.