K. Stout :
Yes, summer pruning can be more an art than a science, but the key is to do
big prunings gradually.
Also, removing large branches is stressful; so is pruning a little too late
in the growing season, and so is pushing the hardiness zone of cultivars.
And then the poor tree got toasted by a late frost ?!
tc
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[NAFEX] dormant vs summer pruning,
tanis cuff, 04/01/2003