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bonsaiTALK Master Chief
Join Date: Mar-2004
Country: England
Posts: 1,477
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Hi Neil,
Personally I would have thought that if this tree were going to survive, it would show signs of bud activity within 6 weeks or so. Japanese maples back bud on old wood quite readily. If the roots were not rotting, then some other factor caused the top section to die. As this is a pretty large base, I take it the scion had been growing successfully for many years, so I'd be looking at the winter temperatures, or a disease of some sort that killed the top section. So long as the base still has a green cambium layer, there is hope for it.
All you can do now is sit and wait.
All the best,
Aaron
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