rockm

Myc is one of those mythical "bonsai miracle" substances that gets alot of attention from people just starting out. I don't speak as a scientist--only as someone that's had the stuff in bonsai.

It certainly can make a difference for bonsai, but it's not going to greatly boost your tree's health. It can help, but it has limitations. For instance, it is highly species-dependent (a species that works on pine, probably won't work on hornbeam), can also be highly dependent on the care you give your trees--too much water with soggy soil, too much fertilizer, antifungicide and pesticides, etc. can all play havoc with it.

Also, it's probably already present in those bonsai in your collection that like it--if they've been kept outdoors. I've found that will appear mostly by itself in bonsai pots. You can't hurry the process along by buying the prepared mixes at nurseries. You can hurry it along to some extent by keeping some soil already innoculated with it to add to trees at repotting time.

It's a naturally occuring fungus that colonizes where it can. It will appear spontaneously without any help from the bonsaiist, if the plant, care, etc are right. If you've got mushrooms growing from time to time in your bonsai pots with your trees, odds are you've got healthy myc.