Jeanie - I've had to use an axe on a hosta but not with baptisias...yet. Last year I pruned it back by a foot around July, at ground level, to keep it from flopping on the lawn. That may be an annual event unless I can get more of it removed. It's huge and over 20 years old now.
Deebie - new divisions, taken from the edge of the base, will grow. I've done it.
Jason - the salvia is worth buying if it doesn't come back!
Thanks, Chelle! I'd never have known that fact unless you mentioned it.