 You can give them a haircut back because most of them will re-bloom, especially the shorter or the newer varieties. The first gentleman I called was talking about the bridal veil, which is a very old variety, and that only blooms once. But the newer varieties, the double plays and a number of the flame spireas will bloom a second time. So, yeah, once they're finished, give them a little topping, take off about six inches, round them off nicely, shape them as you prune, and they should come back with another bloom or two.