treevet

You are likely sending fertilizer down to unattached roots as roots were severed with a chainsaw thru the only available perimeter. This tree is living off stored carbs IMO, in the side showing stress. The tree is doing the work that matters, not you. Silv maple is a very prolific grower tho, and not only in the canopy. Stranger things have happened than it regenerating enough roots to do the job.