I have a passionflower growing up through a tree which usually has it's foliage damaged in the frosts, so therefore stays a decent size. This year with all the warm winter weather it has gone mad! I have shots of it coming up all over the place, some even 6ft away from the main plant. It's even coming up between the slabs which form the path in my greenhouse. I don't want to damage the plant but wonder how I can keep it in check a bit.