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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.
Cancel. Heavy pruning can sometimes damage a boxwood if you're not careful. Find out how far back Japanese boxwoods can safely be pruned without damage with help from a certified horticulturist in this free video clip.Part of the Video Series: Grow Guru.oxwood's are going to sprout from pretty much anywhere along their stem. So you don't have to worry too much about how far back to cut it. You can use a hedge trimmer to do this if you have a big hedge. I prefer to cut one branch at a time.