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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.
Never fertilize a boxwood in late summer, however, as this can encourage late growth that can be damaged by frost. You can fertilize newly planted boxwood in late fall, if necessary, to promote root growth. Boxwood requires specific soil pH -- between 6.5 an 7.2 -- to properly utilize fertilizer. To increase soil pH below this level, add dolomitic lime, which should keep the pH at the correct level for four to seven years.