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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.
If that old wood is too tall, you will have boxwoods-on-a-stick and not gain much visually for all your trouble. Barnsley Gardens, an old estate in North Georgia cut back their 200 year old boxwoods quite low with good success.Fertilize with a balanced fertilizer like 10-10-10 or 8-8-8 and make sure not to drop the ball on your watering as the boxwoods leaf out.f that old wood is too tall, you will have boxwoods-on-a-stick and not gain much visually for all your trouble. Barnsley Gardens, an old estate in North Georgia cut back their 200 year old boxwoods quite low with good success.