Posted: 08/11/2013 at 09:18
No need to feed your buddleia usually but if you cut it severely .......which won't hurt it; I have done plenty of them......I would give it a feed, maybe fish blood n bone, in spring. Just make sure cuts are as clean and neat as possible
You can't really stop it growing over your window by feeding but just prune any wayward branches as they appear. Your new growth, and subsequent growth, will not be as thick as wood you are cutting now.