successful grafts that don't grow
I have a pretty good ratio of grafts that take on apple, plum, apricot, and pear...but I've also had some of these grafts that grow a bit the first year, and then never leaf out the second and third years. They just sit there, the wood looks alive and there are buds, but nothing happens. Or they might poke out a few small leaves...but no more. In contrast, other grafts send out nice shoots the first year (6+ inches) and leaves.
I've been wondering if applying gibberellic acid might give a boost to these sluggish grafts.
Does anyone have any suggestions that I can try with these sleepy grafts? And what could be causing this problem?