Buxus Sempervirens, also known as common boxwood, according to University of Connecticut, is grown widely in the southern US. It is native to Asia, Europe and Africa and is hardy to USDA hardiness zone 5. Buxus sempervirens is a broad-leafed evergreen shrub, like holly, that grows up to 20 feet tall and is usually used as an ornamental or hedge plant. It prefers moist soil and full sun to thrive. For healthy growth, prune Buxus sempervirens in mid to late spring or summer, advise The University of Rhode Island Master Gardeners.
Remove any dead, damaged or diseased foliage at the base of the Buxus sempervirens.
Thin the interior branches of the boxwood. Pull back the dense foliage on the boxwood reach into it at a depth of 6 inches. Cut back several branches from the inside at the base of the boxwood. Remove 10 percent of the branches from the interior of the boxwood.
Remove any over reaching branches from the exterior of the Buxus sempervirens in order to maintain the shape of the shrub.