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Plant Profile: Rocky Mountain Juniper (Juniperous scopulorum)

Juniperus_Rocky Mt J scopulorum Dave Powell, USDA Forest Service A native of dry, rocky ridges in the eastern foothills of the Rocky Mountains, this small evergreen broad pyramidal tree has vertical growing branches and medium texture. Male and female cones are usually produced on different trees with the female cones giving rise to small deep blue berry-like fruits with a whitish bloom that take two year to ripen. The leaves are scale-like and either deep green or blue-green. The red- brown to gray bark is shredding and provides year round interest. Rocky Mountain juniper is a long lived tree, with remains in New Mexico suggesting they were 2,000 years old. In spite of its longevity, this tree in intolerant of wet soils and the heat and humidity of the Deep South. Although it is susceptible to juniper blights and is an alternative host to cedar apple-rust, it is a valuable garden plant and is popular as a specimen, hedge, screen, foundation planting, and in containers. The cultivar ‘Skyrocket’ is very popular because of its columnar upright growth but it is very susceptible to fungal disease and is being superseded by ‘Blue Arrow’ that has more disease resistance. Many cultivars are available offering variety in foliage color, size and shape.

Type: Evergreen small tree

Outstanding Feature: Adaptability

Form: Pyramidal

Growth Rate: Slow to moderate

Bloom: Male and female cones are produced on separate trees; female cones produce blue berry-like fruit that take two years to ripen.

Size: 30-40’ H x 3-12’ W

Light: Full sun

Soil: Average, dryish, well-drained; does not tolerate wet soil

Hardiness: Zones 4-8

Care: Low maintenance

Pests and Diseases: Susceptible to blight, canker, aphids, bagworms, spider mites, root rots, twig borers, webworms and scale.

Propagation: Cuttings

Outstanding Selections:

    ‘Blue Arrow’ (upright, columnar, disease resistant)
    ‘Blue Creeper’ (low, speading; blue foliage color that intensifies in winter)
    ‘Moonglow’ (dense, pyramidal with little pruning)
    ‘Tolleson’s Blue Weeping’ (foliage in silvery blue stripe)

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