Common or American boxwood, Buxus sempervirens, is a wide-spreading shrub or small tree with very dense evergreen foliage. The leaves are oblong-lanceolate to oval in shape, 1/2 to 1 1/2 inches long and are broadest at or below the middle. Leaves are usually shiny, dark green on the upper surface and pale green on the lower surface. Flowers, borne in early spring, are pale green and hardly noticable. They commonly grow 5 to 10 ft tall, though old plants may attain a height of 20 ft. in tree form if left unpruned. This species and most of its cultivars are tolerant of cold weather. The Americans we are selling here are all well structured with an increadible root system. They will grow quickly with a little care and will need pruned once a year to maintain good form.