What if I don't cut back a butterfly bush?
I have two buddleas (Black Knight, I think) going into their third year. I used to lose them by cutting them back too early, so I've learned to wait til I see new growth and cut above that.
But this year the new little sprouts (so far) are showing up farther from the base. The top of the branches are at about 6' high. I do want tall plants, and I'm wondering if it's a bad thing to just leave them and prune out ugly dead stuff once the new growth gets going.
I'm afraid if I prune them too low, I'll kill them, but that if I don't cut out a lot now, I won't get new healthy branches. Any advice?