Hah, I was about to respond with admiration at your successful grafting. So far I am 0 out of gazillion, grafting onto cerifera, californica and even my Biqis from an earlier buy. Sadly, my Californica which is many many years old looks like it is dying. I am not sure if this is because of all the rain we had or the fact that it is surrounded by banana plants. Or if they just have a finite life span. My cerifera, both in pots and in the ground are all hale and hearty but so far no success with the grafts. I have decided I am just a crappy grafter though I'm doing okay with persimmons and avos.
One thing I have become really intrigued by is the fact that my three yang mei from the most recent buy, two Wusu and one Dong Kui, are all pushing growth from both below and above the graft. Since the consensus seems to be that the rootstocks have a 50-50 chance of being male does it make sense to let these below grafts continue to push to give me better odds of having a male in this harem?
Somewhat related, this morning I inspected my two inground Biqi from last year's buy and have come to the conclusion that the so-called female looks to me like a failed graft and the so-called male looks to me like a successful graft. The only sense I can make of this is that the labels got switched somewhere along the line. On the other hand, the Biqi so-called male is huge and the so-called female is small and delicate so I guess I will just wait and see on the happy day when they flower