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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.
Cut back dead, diseased or damaged branches from the shrub using sharp, sterilized pruning shears, or use a pruning saw if the wood is thick. Make a 45-degree cut to sever a section of the branch from the remaining wood, or snip off the entire branch if the damage is extensive and irreparable.hether growing the dense, impenetrable shrubs as specimen plantings or growing them close together to form a natural screen, pruning is an essential part of care and maintenance that keeps the shape and size under control. Cut back your overgrown boxwood shrub in spring.