After searching through the newsgroups, it appears that most people
cut back their butterfly bushes nearly to the ground. However, out
here in sunny California (Zone 9), the foliage on both my Butterfly
Bushes came through the winter quite nicely. One is a shrub-sized
bush about three feet tall and wide, while the other is the same
bushiness, but nearly seven feet tall.

If the bush is looking healthy, is there a reason to cut it back to
the ground? Does it flower on new growth, or does the pruning
stimulate flower production? Or should I just leave well enough
alone?

Thanks.

-Fleemo