Boxwoods are grown mainly for their green foliage and not the seasonal flowers. Further, timing the pruning in accordance with the seasonal bloom may lead to overgrown shrubs. Try to prune heavily before the growing season begins, usually before spring. D

Depending on the size and shape of your frame, you may need more than one plant to fill the form. The best time to trim boxwoods used in topiaries is in the spring before new growth begins. Train smaller branches to conform to the structure and prune larg

How to Trim Overgrown Boxwoods. Boxwoods are hardy, durable shrubs. If your boxwood has become overgrown, all you'll need is a pair of sharp, clean pruning shears or loppers.