Oakleaf - starting a new plant from a long branch
I have a beautiful oakleaf hydrangea next to my front door. The first few years I pruned improperly and it didn't bloom. Last year I left it alone and was rewarded by abundant blooms in May and June through August. So happy. I did all my trimming before the first of July.
Somewhere, either in GW or elsewhere online, I read that it's possible to get a portion of a long branch to root and start another plant. I can no longer find the thread. One of my plant's branches is quite long and reaches the ground. Rather than risk it breaking and losing the entire section, can I secure it in place, cover it with soil, and hope it takes root. Later I could sever it from the main plant.
Is this possible? Do I need some sort of rooting compound?
Thanks in advance.