Home Gardening Highlander Boxwood (Buxus sempervirens Highlander): Fast growing, upright shrub. dark green foliage holds its color all winter. Leaves are slightly larger than common boxwood, feature the same dark green. Can grow 2 feet per year. pyramidal growth habit makes it good choice for flanking entries. Full sun to light shade and moist, well-drained soil. 6-7 feet tall, 3-1/2 feet wide. Zones: 5-9