I've read several postings with good info on this website. You may want to search for them. I have pruned in Spring and Fall with success. Good luck!

Thanks, Starr. :)
I don't have much luck with the search engine here, but I'll try again.

I'm in the same predicament. Planted the butterfly bush this spring and it's sprawling out in all directions and a few sprigs are growing straight up. From what I've read, pruning should be done late winter or early spring. I think I'll wait it out. Here is an awesome link that will answer your questions.

Here is a link that might be useful: Pruning Buddleia

This is my first year with these plants but I can tell you they do bloom on new growth so you wouldn't be removing next years blooms if you trimmed it now. I even have a 'White Profusion' that I started from a tiny cutting this summer that is blooming it's head off in a 6 inch flowerpot right now so they're pretty tough plants. Mine are rather untidy looking, too, something I wouldn't usually stand for but since I'm growing them for the butterfilies and hummers, I try to overlook that behavior. :-)

I see you are in a different zone and that may make a difference in when you prune.

Mary

Thanks for a terrific link, Linda.
I want David Epstein to be my gardener. What a sweetie. :)
I'm still thinking I should prune now, at least the longer branches, because otherwise I'm afraid they will break the plant right in half.
I didn't know Buddleia were an invasive in some areas! They are precious here in upstate NY. I planted 3 more in the backyard last summer. One didn't do well, and I mourned. I also recently bought 3 more (ebay!) and am planning to get those planted this weekend.
Maybe next year we'll see more butterflies.

It's interesting that it's mentioned in the video that they're invasive in places like California.

I live in central New Jersey and have found a couple of baby butterfly bushes popping up in my garden! I have one that I divided several times and replanted throughout my yard and my neighbor has a few, so maybe with all those others around I was bound to see some popping up where I didn't plant them. So far, they're not invasive, but I could see how that might happen.