I live in Chicago and have a huge butterfly bush (its about 4years old). I cut it way down almost to ground level (about an inch from ground) every October just before Halloween. Every spring new shoots come up bigger and with more flowers. I hope this helps you.
I live in Chicago and have a huge butterfly bush (its about 4years old). I cut it way down almost to ground level (about an inch from ground) every October just before Halloween. Every spring new shoots come up bigger and with more flowers. I hope this helps you.