I didn't use any GA on this at all and when I do use it, it's rarely on flower buds. I cut off the blooms yesterday and won't let it bloom again until it's at least three times the size it is now.
I've found rooting hydrangeas can sometimes be tricky .. this one took 3 months to make roots .. though being Fall/Winter with soil temps below 65 degrees may have been a factor. I didn't do anything special .. just stuck it in some potting mix and did not use rooting hormone
