There are white and pink varieties also. I grow blue, white and pink. Vitex is not completely hardy here, so they are more like a large shrub. I do cut the blooms so the bloom season lasts longer and they get a bit bushier.
Since they emerge so late in the spring, they're not as desirable up here as they are just a few hours south. Very few nurseries carry them, but I think they make a beautiful xeric shrub.
edit: I'll post photos when mine bloom!
