I have a hedge of Nellie Stevens that is starting to get a bit "arm-y"
(it's not growing up excessively, it's throwing out long branches). How
severely and when can I cut it back to promote density instead of long
limbs? The plants are about seven-eight feet tall at this point. It's
been in the ground for a number of years, but this is the first year
that it seems to have bolted in this fashion.