When Do I Prune Arborvitae Hedge?

robinholly added on September 8, 2015 | Answered

We have a hedgerow of 28 emerald green arborvitae and need to keep them at 6-7' in height to stay within the by-laws of our HOA. Should I begin topping the trees now or wait until they have reached their desired height? They are all approximately 4-5' tall now and seem to grow about 9-12" per season. They are planted 24" apart but are not yet touching. The photo was taken within the last week. Thanks!

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