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Tips and Warnings.
Jun 29, Selective Pruning of Boxwood Use a sharp pair of bypass hand pruners to selectively remove stray, damaged or dead branches. Make your cut at a point along the branch just above the main form of the plant.
Remove dead branches to a point a couple inches below their point of origin. Apr 23, Season for trimming boxwood For those boxwood shrubs shorter than about 3 feet (1 meter): the best time to prune is around April-June and August-October.
So, in short, they are pruned twice, and a tip to remember this is that these are the “A” months. If the shrub needs its size reduced, only bare limbs are left and recovery is slow.
The best pruning technique is to use hand pruners to take out individual limbs to reduce the size of the plant over a couple of years. If you have a big boxwood, reduce its size.