No pruning is necessary when you plant"Green Giant" where it can attain its full height and diameter without encroaching on buildings, fences, power lines or other more desirable plants.
Sep 21, Trim Green Giant trees once a year to the height you desire. Standing on the ladder, use a hedge trimmer to cut a few feet off the top of the tree.
Create a hedge out of the trees by cutting off most of the height. The green giant arborvitae is a large, vigorous, fast-growing evergreen- shooting up by as much as 3 feet per year until maturity. Its natural pyramidal to conical form boasts dense, rich green foliage that darkens or bronzes slightly in the winter.
This is an exceptional landscape tree for use as a screen, hedge, or single specimen. No pruning is required for Thuja Green Giants. They’ll quickly reach their massive heights if left untouched. You can promote wider growth that spreads out into a bushier formation by cutting back around a third of the tree’s central leader.