If you are making drastic changes to its height, it is best to.
Aug 16, Gaétan Paquet, an ecological arborist with 30 years’ experience pruning arborvitae hedges, recommends late summer pruning, from August 15 th to 30 th. By pruning at this time, at the tail end of the hedge’s growing season, the hedge will retain a dense, very conical shape through the winter that will prevent the snow from clinging to the twigs and prevent any snow buildup, as even Estimated Reading Time: 3 mins.
Dec 10, Late fall -- about December -- is another excellent time to think about trimming emerald green arborvitae or other kinds of arborvitae. Trim in late fall, when there is little or no chance of a. The best time to conduct any pruning maintenance on arborvitae is in early spring, before new growth begins.
In late May to mid-June, with new growth starts to appear exactly when will depend on your local climate, prune to shape the hedge.
Pruning Season. Dead, broken or diseased twigs or branches on arborvitae plants may be removed any time of year. This includes cutting away massive webworm nests or excessive evergreen bagworm cocoons. Pruning Arborvitae to Shorten a Tall Hedge Late spring after flowering - After the arborvitae has flowered and before mid summer is the best time to prune back a tall hedge row.
The plant can maintain itself after flowering and maintain the height you are looking for.