Green Mountain Boxwood

Green Mountain is a slow-growing evergreen boxwood hybrid with an upright oval to conical outline and small green leaves. Virginia Tech reports a size of about 4 feet tall and 3 feet wide after 15 years, while NewGen cautions that zone 4 performance is unreliable. Its compact shape suits clipped hedges, formal edging, and topiary. ## Form and use Green Mountain was bred from Korean and common boxwood parents. Virginia Tech describes an upright oval habit and growth of about 3 inches per year, making it useful where a narrow, structured evergreen is wanted. Allow for gradual growth and prune selectively to maintain the outline. ## Siting Plant in sun or partial shade in well-drained soil. NewGen recommends treating zone 4 as unreliable; the more conservative hardiness range is zones 5–8. Light levels affect density and winter color, so avoid assuming every boxwood performs equally well in deep shade. ## Health and appearance The foliage remains green through winter in typical conditions. NewGen reports extreme susceptibility to boxwood leafminer and moderate susceptibility to boxwood blight. Leave room for air movement and monitor for foliage thinning or discoloration. ## Maintenance Water new plantings during establishment and keep the root zone evenly moist while it settles in. Once established, avoid waterlogged soil and prune selectively to maintain the intended outline; repeated hard shearing can reduce interior light and airflow. [Virginia Tech Extension](https://www.pubs.ext.vt.edu/426/426-603/426-603.html) describes this cultivar’s growth and form, and [NewGen Boxwood](https://www.newgenboxwood.com/blog/category/History) discusses its hybrid background and disease susceptibility.