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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.
Step 1: Split and Trim. Split the rhizomes into sections, so that each has healthy shoots and good roots. Trim off the older sections farthest from the leaves with a knife, and dust cut surfaces with fungicide. Step 2: Cut Back Leaves. Trim long roots back by one-third, and cut leaves to about 6 in (15 cm). This will reduce rocking by the wind, keeping the replanted section stable until it develops strong, anchoring roots. Replant the sections at the same depth as before in well-prepared ground, spaced about 5 in (12 cm) apart.