I have a tree that received a bad prune job from the power company a few years ago. This particular Maple (Norway, I believe) had an 8" limb cut off at the main trunk; about 5' off the ground. The cut was not correct and has subsequently rotted off and out and has left a cavity. Of course it is half full of water and rotten wood. What should I do? Leave it alone? Clean it out? Drain it? Fill it with something? After reading some threads here on the site; sounds like I should cover it to make sure no more water gets in but is able to breath and just leave it alone...... Advice please.
Pat
Pat