Quote:
Originally posted by Bonsai Noob
I pulled all the moss off and replaced most of the soil other than that around the base of the trunk (about 4/5 inches worth).
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That's probably how your moss redeveloped itself! Next time you repot, use a chopstick or the blade end of a pair of tweezers to remove the upper 1/2" right up to the root crown. Make sure your topdressing drains well.
I wouldn't worry about the growth of true lichens on the trunk unless it gets so dense you can't appreciate the tree.
Regards,
Matt