Rocky Mountain juniper

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

Central Tallgrass prairie

Central-Southern Cascades Forests

Chilean Matorral

Colorado Rockies forests

Eastern Cascades forests

Arizona Mountains forests

What it needs

Conditions

Light

Full sun / Part shade

Water

Low water

Spacing

20 ft

Habit

Small to medium needled evergreen tree, typically 30 to 50 feet tall and 10 to 20 feet wide, pyramidal and often narrowly columnar when young and opening with age into a rounded, oval or irregularly spreading crown, frequently on a short leaning trunk with several stems. The Wildflower Center records it to about 65 feet at the extreme and adds "often much shorter", and on dry exposed foothill sites it stays a 15-to-20-foot tree or barely more than a large shrub. Bark is red-brown on the branches, weathering grey and shredding in long strips on old trunks.

Care tips

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Do not plant it in a humid summer climate. The Wildflower Center states outright that it does not adapt to high humidity or high night temperatures, and the failure mode is slow chronic twig blight rather than an obvious quick death - which is why people keep trying it in the Southeast.

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Keep it away from apples, crabapples, hawthorns and quinces. It is an alternate host for cedar-apple rust and its relatives; the juniper shrugs the galls off and the orchard does not.

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Buy a sexed plant if you want the blue cones, and check the cultivar. Many named selections are single-sex clones and some, like "Wichita Blue", are male and will never fruit at all.

Lifecycle

Planting

Plant in spring in full sun, in dry to average, well-drained soil. The Wildflower Center rates its water use low, its drought tolerance high and its CaCO3 tolerance high, and lists everything from rocky caliche and sand to clay loam as acceptable ground. Drainage is the one non-negotiable: it will not tolerate wet soil.

Transplanting

Move young container or balled-and-burlapped stock while dormant. Like most junipers it establishes a deep root system quickly and resents being lifted afterwards, so plant it small and plant it once.

Early growth

Slow - expect 6 to 12 inches a year. Water through the first season or two, then largely leave it alone; supplemental irrigation on established plants encourages the root rots it is otherwise free of. Do not plant within reach of an apple or crabapple: this is an alternate host for cedar-apple rust.

Maturity

Long-lived and low-maintenance on the right site. The Wildflower Center flags susceptibility to juniper blight and to cedar-apple rust; Phomopsis and Kabatina twig blights, root rot in wet ground, bagworms, spider mites, scale and twig borers are the standard juniper problem list. In humid summer climates twig blight becomes chronic rather than occasional, which is the practical reason the species fails in the Southeast.

Propagation

Nodal cuttings taken from July to April, preferably after frost, treated with rooting hormone - the Wildflower Center rates this more reliable than seed, and it is how the hundred-plus named cultivars are kept true. From seed, collect ripe cones in autumn or winter, macerate to clean, then give warm stratification at about 60°F for 45 to 90 days followed by cold stratification. Seed dormancy is deep and germination is slow either way.

Pollination

Dioecious - needs male pollinizer

Usually dioecious and wind-pollinated, though occasional monoecious trees exist - male and female cones are normally on separate plants, so only a female bears the blue-black cones and only with a pollen-bearing male within range. This is the same trap the hollies set, and junipers add one of their own: many popular selections are single-sex clones, and "Wichita Blue" for instance is an all-male form that will never carry a cone no matter what is planted beside it. The cones themselves are fleshy seed cones rather than fruit, globose to bilobed, 0.2 to 0.4 inches, usually two-seeded, and they take roughly 18 months to ripen - so a female tree carries two years of crop at once.

Plants don't grow alone

Fruit forage

Bird

Cedar waxwing (Bombycilla cedrorum)

The Wildflower Center names cedar waxwings first among the birds this tree attracts, alongside northern mockingbird and evening grosbeak. Waxwings work fruiting trees in flocks and strip them, and a juniper carrying two seasons of cones at once is a substantial winter store rather than a single-autumn meal.

Fruit forage

Bird

American robin (Turdus migratorius)

Juniper cones are a staple winter food for robins across the interior west, and this is one of the mechanisms by which the tree spreads into grassland and old fields - the seed passes through and is deposited under fence lines and perches.

Fruit forage

Bird

Steller's jay (Cyanocitta stelleri)

Steller's jay overlaps this tree through western conifer and conifer-oak country and takes juniper cones along with the acorns and pine seed it caches. Recorded as plausible rather than documented, because the Wildflower Center bird list names waxwing, mockingbird and grosbeak specifically and then covers everything else with the phrase plus other species.

Shelter / habitat

Bird

Mountain chickadee (Poecile gambeli)

The Wildflower Center documents the tree as providing nesting sites and cover; mountain chickadee is the western montane cavity-nester most likely to use it, and dense juniper foliage is real thermal cover on exposed foothill ground. The shelter function is documented, the specific bird is inference.

Shelter / habitat

Mammal

White-tailed deer (Odocoileus virginianus)

The value here is cover, not food. Rocky Mountain juniper is listed as deer-tolerant, meaning deer do not prefer to browse it, and that is precisely why a windbreak or shelterbelt of it survives to become winter thermal cover where more palatable evergreens are eaten out.

For people

Edible with preparation

The cones are edible in the technical sense rather than the useful one. They have been eaten as emergency food and roasted and ground as a coffee substitute, and Plateau peoples brewed leaf and inner-bark infusions for coughs and fevers and cone decoctions as a laxative and cold remedy, while burning juniper remains ceremonially important across many Native American cultures. This is NOT the gin juniper - that is Juniperus communis, the sibling in this batch, and its cones are the botanical that defines the spirit. Juniper foliage and cones contain oils that are hazardous in quantity and in pregnancy. The real economic use here is the wood: rot-resistant, aromatic and moth-repellent, cut for fence posts and closet linings, though lighter and softer than eastern redcedar.

Native range

Native

Naturalized

Native across 13 US states + 2 CA provinces; naturalized in 2 US states.

AHS heat range

1-7

Native ecoregions

Naturally belongs in 28 ecoregions - its native range crosses a state or province each one spans (not necessarily this exact habitat).

Blue Mountains forests

Canadian Aspen forests and parklands

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

Chihuahuan desert

Colorado Rockies forests

Cross-Timbers savanna-woodland

Eastern Cascades forests

A medium-to-large native shade tree of central and eastern North America, reaching 50 to 80 feet with an ovate-rounded crown and large, asymmetric heart-shaped leaves. In June it carries pale-yellow, intensely fragrant flowers on pendulous cymes - each cluster hung from a distinctive strap-like leafy bract - that ripen into pea-sized nutlets. The fragrant June bloom is a premier nectar source: Missouri Botanical Garden lists it as attracting bees and butterflies, and the Lady Bird Johnson Wildflower Center flags it as having special value to both native and honey bees.

Climate notes

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Native to western North America from southwestern British Columbia and Alberta south through the Rocky Mountains and the western Great Plains into northern Mexico, on dry rocky and sandy hillsides and foothills between roughly 500 and 2,700 m, and needing at least about 10 inches of annual precipitation. POWO returned HTTP 403 for most of this batch, so the WGSRPD range mapped here came from the World Checklist of Vascular Plants rows served through GBIF - the same Kew dataset - verified against the one species in this batch that POWO did answer for. Nothing here is first-hand POWO data.

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The two range sources disagree at the edges and both are shown. Kew includes northeastern and northwestern Mexico (Sonora to Coahuila) but not Texas or Oklahoma; the Wildflower Center lists both TX and OK among the US states and gives the range as "B.C. to AZ and Sonora, e. to ND, w. TX, and Coahuila". The structured per-state list follows the Wildflower Center, the WGSRPD codes follow Kew, and the trans-Pecos Texas populations are exactly the kind of thin outlying occurrence the two datasets treat differently.

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Missouri Botanical Garden PlantFinder has NO species-level page for Juniperus scopulorum. It carries cultivar pages only - "Wichita Blue" and its relatives - so this record is built on the Lady Bird Johnson Wildflower Center species profile as primary rather than citing a cultivar entry as though it described the species. Where MBG rates its Rocky Mountain juniper cultivars zones 3 to 7, Plotwright carries 3a-7b for the species as a conservative editorial reading, not as a copied species rating.

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Humidity, not cold, is the limit. The Wildflower Center records it as cold tolerant and highly drought tolerant, and states plainly that it "does not adapt to high humidity or high night temperatures". A Rocky Mountain juniper in a hot humid summer climate does not die quickly; it declines through years of twig blight. Plotwright assigns an editorial AHS heat range of 1-7 reasoned from that statement and from the dry interior-west native range rather than from any AHS-coded dataset - the ceiling is a judgement about humid heat, and it is deliberately conservative.

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It is the alkaline-ground counterpart to the acid-loving members of this catalog. High CaCO3 tolerance means limestone, caliche and thin rocky western soils are its home ground, which is the exact inverse of the inkberry and winterberry hollies that go chlorotic on lime. Wet soil is the one thing it refuses.

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It is an alternate host for cedar-apple rust, and that is a specifiable reason not to plant it. The rust needs both a juniper and a member of the apple family to complete its cycle; the galls it forms on juniper stems reach about 2 inches and do the tree little real harm, while the same fungus disfigures and defoliates apples and crabapples nearby. Hawthorn and quince rusts use it the same way. Keep it well away from an orchard or a crabapple planting, or choose something else.

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Where its range meets that of eastern redcedar (Juniperus virginiana) across the Great Plains the two hybridise, and intermediate trees are common enough that field identification in the overlap zone is genuinely unreliable. It also hybridises with alligator, oneseed, creeping and Utah junipers. Treat a "Rocky Mountain juniper" bought or found on the plains as a probable rather than a certainty.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Tilia americana

American basswood

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Full sun / Part sun / Part shade

Colorado blue spruce (Picea pungens) is a narrow, stiffly pyramidal conifer from the central and southern Rocky Mountains, and the source of nearly every silver-blue evergreen in cultivation. The colour is real and is the reason it is planted: the needles carry a waxy bloom that reads anywhere from grey-green to an almost metallic pale blue, sharpest on selected cultivars. In its native range, between roughly 6,000 and 11,000 feet from Wyoming and Idaho south to Arizona and New Mexico, it is a cool-climate mountain tree of moist stream sides and canyon bottoms. Planted far outside that range - which is where most people meet it - it is one of the most reliably disappointing conifers in the eastern United States, where humid summers bring on needle cast and cytospora canker and a fifteen-year-old specimen often loses its lower branches and never recovers them. It is also planted far too small: the nursery pyramid becomes a 30-to-60-foot tree. Given cool air, full sun, room, and honest expectations, it is superb and long-lived.

A tough, widely adaptable native shade tree of central and northeastern North America, growing 40 to 60 feet tall and wide with a rounded, spreading crown. Mature gray bark develops the warty corky ridges that make it instantly recognizable, and the round purple drupes are edible and feed dozens of bird species. One of the most pollution- and stress-tolerant street and shade trees available - it shrugs off wind, urban conditions, and wet, dry, or poor soils alike.