sempervirens ’Suffruticosa’) are especially susceptible to infection and death by C. in the mid-1990s and is present throughout Europe. Boxwood blight was first described in the U.K. Since its introduction, the disease has spread throughout the United States. from Connecticut and North Carolina in the fall of 2011. The disease was first reported in the U.S. Common Diseasesīoxwood Blight, caused by Calonectria pseudonaviculata, is a destructive disease that affects all Buxus species and cultivars. Appropriate cultivar selection for winter hardiness and a protected planting location are key for plant success. New spring leaves are also sensitive to frost damage. Boxwoods, like many woody plants in the landscape, are more susceptible to winter burn when they are drought-stressed in autumn. The leaf margins, however, often retain some green color. Symptoms of winter burn on boxwood typically appear as a reddish-orange to brown discoloration along the midrib or entire interior portion of the leaf. They are especially susceptible to foliar desiccation from drying winter winds. Environmental Stressesīoxwood lacks heat and cold stress tolerance. Plants are slow growing and deer resistant. Cultivation after planting should be avoided to not disrupt the shallow roots. Plants should be protected from winter winds, harsh sun and cold.
#Boxwood blight resistant varieties full#
Plants do best is full sun to light shade but newly planted shrubs benefit from shade during establishment. need a well-drained soil and benefit from mulching to keep the roots cool and moist. insularis and the darker green leaf color of B. These hybrid cultivars combine the cold hardiness of B. sempervirens) are very common in the nursery trade and include the cultivars ‘Green Gem’, ‘Green Mound’, ‘Green Mountain’, and ‘Green Velvet’. microphylla but otherwise similar in appearance. Hardy in zones 4-5, Korean boxwood are more common in trade than B. sempervirens, surviving temperatures as low as -25° F. koreana) exhibits superior cold-hardiness compared to B. Leaves can discolor in winter but generally better color than B. Leaves are dark green with a yellow-green underside. sempervirens is hardy is zones (5)6 to 8. Native to Europe, northern Africa, and western Asia, B. The species is quite large, growing 15-20’ tall and wide. This variety grows 3-6’ tall and wide and is adaptable in zone 6.Ĭommon or English boxwood( Buxus sempervirens) is the traditional boxwood of formal, European gardens. japonica) has darker green leaves and less winter color change compared to little leaf boxwood. Leaves are medium green leaves in summer turning yellow, brown, or bronze in winter. Native to Japan and Korea, it is hardy from zones 6 to 8. Littleleaf boxwood ( Buxus microphylla) is a densely-branched, rounded to mounded shrub growing 3-4’ tall and wide. In some landscapes, it may no longer be feasible to use boxwoods in the wake of boxwood blight occurrence. Unfortunately, boxwood blight has become a serious threat to boxwoods in managed landscapes throughout the region. Although the hardiness of the species is stretched in southern New England, many cultivars and hybrids offer improved cold hardiness, better suited for northern climates. A go-to for the evergreen foundation in landscapes, boxwoods bring to mind formal gardens and sheered shapes.
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