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I saw your report on trimming and shaping shrubs and wondered when was the best time. No, it is not too late to trim your boxwoods. I prune my boxwood hedge twice a year, once in the very early spring and again in late summer. Believe it or not, the hedge thrives from this kind of treatment. Boxwoods are a broad-leafed evergreen â just like hollies, azaleas and rhododendrons.
English boxwood: I believe pruning English boxwood properly is the best step towards good health and should be the first step in any plant health care program. English boxwood becomes dense, too dense for their own well being.f you have nine-inches of growth, only prune out a section of stem up to nine-inches long. You can take out more but as a rule this seems to work well. If you follow this green layer all around the top and sides of the plant, your boxwood will be well thinned.