I found this out by accident. I took some woodchips that had been used as bedding in a chicken coup (so it had feathers and poop in it), put down a layer about

I found this out by accident. I took some woodchips that had been used as bedding in a chicken coup (so it had feathers and poop in it), put down a layer about four inches thick, then covered it in a rich mulch that had lots of mycelium in it already[1], and left it alone for about six weeks. The mycelium went all through there and converted the woodchips to a chalky almost asbestos-like form. I had another experience with this same mycelium mulch[1] where it literally sealed off an area of sandy soil and routed water somewhere: https://news.ycombinator.com/item?id=15059654 https://news.ycombinator.com/item?id=15059654 [1] Kellogg's GROMULCH 2-in-1, it's my secret weapon.