The Green Mountain Boxwood (Buxus 'Green Mountain') is a popular, cold-hardy, broadleaf evergreen hybrid known for its upright, pyramidal shape, dense deep-green foliage, and tolerance for pruning, making it excellent for formal hedges, topiaries, or specimen plantings in full sun to partial shade, requiring well-drained soil and protection from harsh winter winds for best performance. 
Key Characteristics:
Form: Naturally develops a dense, upright, pyramidal or oval shape.
Foliage: Small, round, dark green leaves that hold color well in winter, with minimal bronzing.
Growth Rate: Slow to moderate, maturing around 4-5 feet high and 2-3 feet wide, though it can get larger.
Hardiness: Very cold-hardy and resistant to deer and rabbits. 
Growing Conditions:
Sun: Full sun to partial shade; prefers morning sun.
Soil: Adaptable to various soil types but requires excellent drainage.
Water: Prefers average to moist conditions and should not dry out.
Location: Benefits from shelter from strong winter winds.