I inherited a young climbing hydrangea when we moved into our house last year. (I think it's a couple of years old and has not bloomed yet.) It's planted up against a stone retaining wall. I can't get it to stick to the wall! It has lots of the clingy rootlet things on it, and I have it propped up so that it's resting against the wall, but so far it has not started to cling. One in a while (strong winds etc.) it just falls over. Can anyone suggest a way to encourage it to stick to the wall? I can't figure out any other kinds of fasteners.