In my own experience, I prune in the spring.
It is best to use templates to cut your boxwood tree to the correct shape. Measure the diameter of your boxwood tree sphere in order to produce a template.
Now on Twitter.
Then draw the measured diameter on firm cardboard or a thin wooden panel. Cut out the semi-circle that you have drawn. May 10, A good time to start boxwood cuttings is when you trim your boxwood shrubs in Spring. You will have dozens (if not more) cuttings to use from your trimmings. (many also prune again in late Summer, typically mid Sept) Start with a nice healthy boxwood, this one happens to be in a container. As you can see this Winter Gem Boxwood has fresh green bushcleanup.bars: Jul 08, For established boxwoods, tie a string or twine at the base of the plant and spiral the twine up and down the plant to hold it together and gently brush snow off plants as soon as possible.
This will help prevent damage from falling ice and snow. Inspect plants for winter damage in the spring and prune out affected bushcleanup.bar Dec 28, While dead, diseased or broken boxwood branches can be removed any time you notice them, begin renewal pruning in late winter to early spring, before any. Jan 25, Boxwoods can be pruned any time but late summer and early fall. This is because pruning then will spur new growth that won't harden off in time for winter and be killed by the cold.
Severe late summer pruning followed by a cold winter could even kill the entire bushcleanup.bar: Steve Bender.