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Neglect regular pruning, though, and a wall of evergreen foliage soon looms over your garden. Severe pruning of boxwoods can have mixed results, but you may be able to safely cut the shrubs back by 2 to 3 feet depending on their size, their health and the time of year you prune.enewing Boxwood. Though Viette's Beautiful Gardens in Virginia reports that vigorous boxwoods can survive after being cut to within 2 feet of the ground, renewal pruning is most often recommended for an overgrown boxwood.
To remove large branches, three or four cuts will be necessary to avoid tearing the bark. Make the first cut on the underside of the branch about 18 inches from the trunk. Undercut one-third to one-half way through the branch. Make the second cut an inch further out on the branch; cut until the branch breaks free.