Any plant than can grow out of mortar halfway up a wall is as tough as old boots! www.alisonpike.com/blog/
I always prune my buddeja's hard back - if you have the courage to do so, they will respond well in my experience.
Hathi wrote (see)
This video is for rose & for Buddleja. Somebody has got it wrong.
Why is it wrong, it looks spot on to me, she says, Prune budleja back to base, in March, thats what I always do.
Looked OK to me as well Lyn.
I take mine back further to begin with so that the hefty framework is less obvious. But that's a personal preference