Honeycomb Butterfly Bush is proving to be a tough plant. After several below freezing nights it's still mostly green and putting out new flowers. If it holds up long enough I'll put Christmas lights on it.
That is a really interesting question. We grow Honeycomb Butterfly Bush in Wisconsin too and I would not say it is the earliest blooming or the most floriferous variety that we grow, but it does bloom for us. I am assuming that you have it planted in full sun (not that this would be as important in your very warm zone) and the other thing I saw from this link is that Butterfly Bushes planted too deeply (like Peonies) will put out a lot of leaf growth but no flowers:
http://www.gardenguides.com/94296-reaso ... bloom.html
Additionally, here is the Dave's Garden site where some people from Florida talk about their experience growing it:
I might suggest a few things:
-Make sure planting location is in full sun
-Move it to a new location where you have never grown it before
-Don't plant it too deeply
-I'm not sure what your soil is like, but I have never fertilized Butterfly Bush in our garden---if you are giving it a balanced fertilizer, this may be encouraging leaf growth and no flowers. Try one of the "Bloom Booster" fertilizers instead (the last number will be higher---which encourages flowering.) I also noted from the Dave's Garden site that Butterfly Bush grows best in neutral soil or soil that is just slightly alkaline or acidic---if your soil is highly acidic or alkaline, this might be the reason for no flowers (a container could help here.)
-Try growing it in a large container just to see what happens
Buddleia 'Orange Sceptre' is another variety of Butterfly Bush that is definitely worth trying for hummingbirds and it's very vigorous and blooms reliably and would definitely be hardy for you:
https://www.plantdelights.com/products/ ... ge-sceptre
It does grow well in a container and most likely would bloom all winter in Florida (ours was still blooming just a week ago when we dug it up.) The hummingbirds really love this one since it is native in Mexico and Central America.
Good luck and please keep us posted.