Quite a stunner, isn't it?? Every year at this time, folks ask me "What IS that?!" Why it took Vitex so long to become popular in our area, I don't know, because it's a natural choice.
It's a great plant for the common areas - very hardy and drought-tolerant. Probably not so great for small back yards, though, as it spreads quite wide. It also tends to droop low over the sidewalks, forcing us dog-walkers to duck, but it's so pretty we can forgive that much.