I tried that one year, Clint. Trying to keep them at 3' meant no blooms that year. I do know some people who prune them clear to the ground each winter, so the following year they only grow to 4' or so. People just need to be aware that they will get large and plant them in the appropriate place.
In my opinion, their best use is for color in a low maintenance area where they are viewed from a distance. They make a great hedge.
