I'm not a buddleia expert, but, I think the butterfly bush pruning rules apply mainly to cold, continental type climates, where a late freeze in May could stunt its ability to successfully make new growth for the duration of the growing season. I don't think it gets that cold in London, does it? I'm under the impression that all of Britain has a fairly mild climate, thanks to the Gulf Stream. I live in a mild climate (except for the hot, humid summers) and mine hold most of their leaves all winter long - I prune mine to about 2 ft. - 3 ft. tall in early spring. If yours has grown 10 ft. tall, then you must be getting enough heat for good growth. I say, go ahead and prune it, it'll probably do it good, make it bloom more, which is what you really want. It's your garden, and if it's blocking much-needed UK light, then it needs a trim! Sherry

Maybe better pruning a little late than too soon. I pruned mine back too early when we were having weather in the 70's back in March and almost killed them. The warm weather went on for so long that I thought it was going to stay that way (it didn't). Anyway, I agree with horster and I'd say to prune yours and have blooms a little bit later than usual, but they will bloom. Cathy

Hi Keith, Thank you so much for the reply! I'm in the Portland/Vancouver area; I have looked up where you live at it is way up there. I suppose I should have specified where I lived! Oops. :) You are very sweet to offer up your bushes and if I have trouble finding some a little closer I may be making a trip in your direction. I will certainly keep you informed if I decide to come up to Snohomish county. Thanks again! Natalie

Thanks gals, think I'll give it a try. I don't have anything to lose at this point. Meghan- I wish I could help you. In my neck of the woods, BB doesn't require much care at all. I cut it back to about 18 inches in spring and let her do her own thing. She's in a mostly sunny location with ample water, but gets no special care from me. Tracy