i trim the hedge with the hedge cutters twice a year but it still
increases in height a few inches a year, so every few years i cut
back
Try using "rugby posts" made by taping a crossbar on two upright bamboos. I
use this to keep my Leylandii hedge to a uniform 7 foot on a sloping gatden.
I cut twice a year (never when birds are nesting) and the hedge is as dense
and luxuriant as the wife's beard.....