// SPECIES PROFILE · TREE · NATIVE · NUANCED

Eastern Redcedar

Juniperus virginiana

Both an essential native and the most aggressive woody invader of unburned NE Oklahoma grasslands, the Eastern Redcedar is the small evergreen juniper that defines old fields, fence rows and prairie edges from the Cross Timbers north to the Flint Hills. A long-lived dioecious conifer with shreddy reddish bark and glaucous-blue fleshy female cones, it is dispersed by cedar waxwings, hosts the juniper hairstreak butterfly, and — in the absence of fire — converts open prairie into closed cedar woodland in a few decades. Treat it as an indispensable wildlife tree on the right site, and as a management problem on the wrong one.

// QUICK FACTS

Family: Cupressaceae (cypress family)
Native range: SE Canada → N Florida, west to E Great Plains
Replaced westward by: J. scopulorum; SW by J. ashei
USDA hardiness: Zones 2–9 (Tulsa = 7a/7b)
Mature size: 30–50 ft typical · to 90 ft on best sites
Crown form: Conical → columnar → broad in old age
Lifespan: 150–300 yrs typical · oldest 940 yrs (WV)
Sex: Dioecious — separate male & female trees
Pollen shed: Late winter / early spring (allergen)
Cones ripe: Sept–Nov, persisting into winter
Sun: Full sun (very intolerant of shade)
Soil: Anything drained — rock, sand, clay, alkaline limestone
Water: Extremely drought-tolerant; deep fibrous root system
Wildlife: 50+ bird spp · juniper hairstreak host · winter cover

Eastern Redcedar (Juniperus virginiana) — characteristic columnar form of an old-field pioneer — Juniperus virginiana exhibiting its characteristic conical-columnar form in an old field — the classic post-fire-suppression pioneer that NE Oklahoma rangeland managers know well. Photo: Wikimedia Commons (File:Juniperus virginiana near Oxford, Ohio.jpg).

Identification

[ field key — bark · foliage (juvenile vs adult) · cones · habit ]

Habit & Bark

Slow-growing evergreen conifer, typically 30–50 ft in NE Oklahoma with a single short trunk 12–39 in diameter and a dense conical to subcylindrical (columnar) crown that broadens and becomes irregular with age. Bark is the diagnostic giveaway: reddish-brown, fibrous, peeling off in long narrow vertical strips. The wood beneath is aromatic, with pale yellowish sapwood and a striking pinkish-red heartwood — the source of every "cedar chest" and "cedar closet" in the eastern US.

Foliage — juvenile vs adult

Two leaf forms, often on the same tree, are the single most reliable ID feature:

Juvenile leaves: sharp, spreading, needle-like, 5–10 mm long, in opposite decussate pairs — prickly to the touch.
Adult leaves: tightly appressed, scale-like, 2–4 mm long, smooth and soft, hugging the twig.

Juvenile foliage dominates plants under three years old and persists as scattered shoots inside shaded portions of mature crowns. This dual foliage distinguishes J. virginiana from look-alike Ashe juniper (J. ashei) of the SW Oklahoma cedar brakes.

Cones — the "berries"

Eastern Redcedar is dioecious: male and female cones grow on separate trees. The familiar blue "berries" are actually fleshy female seed cones 3–7 mm across, dark purple-blue under a heavy white wax that gives them a pale sky-blue cast when ripe (Sept–Nov). Each contains 1–3 wingless seeds. Male pollen cones are smaller (2–3 mm), tan-yellow, and release the notorious clouds of allergenic pollen in late winter — if you've ever walked past a yellow-tipped redcedar in a February breeze and watched it smoke, that's a male tree.

Confusables

Often confused with Juniperus ashei (Ashe juniper, "mountain cedar" of the Arbuckles and Edwards Plateau) which is multi-stemmed and has a broader crown; with J. scopulorum (Rocky Mountain juniper) further west; and with planted Thuja occidentalis (eastern white cedar) which has flat sprays of foliage and dry woody cones. J. virginiana is the only native juniper across nearly all of NE Oklahoma.

Habitat & Range in NE Oklahoma

Juniperus virginiana is a textbook pioneer species — unusually long-lived for a pioneer — that colonizes disturbed open ground faster than almost any other tree in the region. Across NE Oklahoma you find it on limestone-derived soils of the western Ozarks, sandstone ridges of the Cross Timbers, abandoned pastures and old fields throughout the Tulsa, Pawhuska and Bartlesville corridor, fence rows wherever birds perch, riparian terraces along the Verdigris and Caney rivers, and increasingly throughout what was historically tallgrass prairie. It tolerates the full range of regional soils — rocky chert ridges, deep alluvial bottoms, compacted urban clay, and the alkaline limestone outcrops of Osage County — and is conspicuously absent only from deep shade under closed hardwood canopy, where its seedlings cannot recruit.

Critically, redcedar is fire-intolerant: low branches near the ground catch easily and a single low-intensity grass fire historically killed seedlings outright. Pre-settlement tallgrass prairie burned every 1–5 years from lightning and Indigenous burning, holding redcedar to scattered fire-refugia on rocky bluffs and creek breaks. Post-settlement fire suppression, plus dispersal by cedar waxwings perching on barbed-wire fences, has produced what NE Oklahoma ranchers and ecologists now call the "green glacier" — a steady, decade-by-decade conversion of open prairie into closed cedar woodland. Oklahoma State University Extension and the Noble Research Institute (Ardmore) have documented this as the most economically and ecologically significant woody encroachment problem in the state, with measurable losses in forage production, watershed yield, grassland-bird habitat, and small-mammal diversity once cedar canopy cover exceeds roughly 10–30%.

Ecology & Wildlife Value

[ frugivory · larval hosts · cover · cedar-apple rust · encroachment ]

Birds & seed dispersal

The fleshy female cones are winter-persistent and one of the most important cold-season fruit crops in the region. Cedar waxwings, American robins, Northern mockingbirds, Eastern bluebirds, yellow-rumped warblers, wild turkeys and bobwhite quail all feed heavily; mammal dispersers include foxes, raccoons, opossums, and coyotes. Cedar waxwing gut passage roughly triples seed germination rates versus uneaten seeds — this is the species' primary dispersal vector and the reason cedars line every fence row and powerline.

Cover & nesting

Dense evergreen foliage gives Eastern Redcedar exceptional value as winter thermal cover and year-round nesting habitat. Over 50 bird species are documented to nest, roost, or shelter in it, including chipping sparrow, mourning dove, mockingbird, brown thrasher, and (notably in NE Oklahoma) the long-eared owl in winter. White-tailed deer use thick cedar stands as bedding cover during cold fronts.

Lepidoptera & insect hosts

Sole larval host plant of the juniper hairstreak butterfly (Callophrys gryneus) — a small iridescent green hairstreak whose entire life cycle in our region depends on this tree. Also the primary host of the bagworm moth (Thyridopteryx ephemeraeformis) — a feature, not a bug, unless you're growing it as a sheared specimen. Numerous other moths and leafhoppers feed on it.

Cedar-apple rust

J. virginiana is the obligate alternate host for Gymnosporangium juniperi-virginianae — cedar-apple rust — and its relatives that affect serviceberry and hawthorn. The fungus produces brown woody galls on cedar twigs that, in spring rains, swell into bright orange gelatinous "horns" releasing spores that travel up to a mile to infect apple, crabapple, hawthorn and serviceberry foliage and fruit. The disease cycle requires both hosts to complete — managing one host breaks the cycle.

Cedar-apple rust — siting warning: Do not plant Eastern Redcedar (or 'Canaertii', 'Burkii' and other female-cone-bearing cultivars) within roughly 1,000 ft (300 m) of apple, crabapple, hawthorn or serviceberry plantings. Spores are wind-dispersed and can travel further on a strong Oklahoma south wind. If you are siting redcedar near a home orchard or a production block, choose a male-only cultivar, choose rust-resistant apple varieties (e.g. 'Liberty', 'Enterprise', 'GoldRush'), or use a different conifer entirely.

Prescribed fire — the historical management: Across the tallgrass and mixed-grass prairies of NE Oklahoma, low-intensity prescribed burns on a 2–5 year rotation are the most cost-effective way to control Eastern Redcedar encroachment and restore grassland structure. Fire kills seedlings and saplings outright, top-kills small trees up to ~6 ft, and (with sufficient fuel and the right conditions) torches mature cedars whose volatile foliage carries fire vertically into the crown. OSU Extension materials — notably Eastern Redcedar Encroachment in Oklahoma (NREM-2872) and the OSU Range Management series — document burn prescriptions, firebreak planning, smoke management, and the regional burn-association model. Hand-cutting and mechanical mulching are useful where fire is impossible (e.g. wildland-urban interface) but are dramatically more expensive per acre and do nothing to restore the prairie understory.

Horticulture & Care

[ planting · siting · cultivars · pruning · windbreaks · management ]

When to plant intentionally

Choose Eastern Redcedar deliberately, in the right place, for the right job. It is an outstanding plant for: windbreaks and shelterbelts (the backbone of the 1930s Prairie States Forest Project), wildlife thickets on rural property, evergreen privacy screens on dry tough sites where Leyland cypress will fail, erosion control on rocky slopes, and as a specimen tree in a meadow or naturalistic landscape. Do not plant it in or adjacent to remnant prairie, in or near home orchards, or as a casual sheared hedge plant where bagworm management will become a chore.

Planting & establishment

Season: fall through early spring, while dormant. Bare-root or B&B seedlings establish far more quickly than container stock for windbreak plantings.
Sun: full sun — redcedar is highly shade-intolerant and will languish under any canopy.
Soil: any well-drained soil; tolerates high pH (alkaline limestone), rocky chert, sand, and dense clay. Will not tolerate standing water.
Hole: 2× rootball width, same depth. Backfill with native soil only.
Spacing: 6–10 ft for a windbreak row, 15–25 ft for wildlife thickets, 25–40 ft for specimen trees.
Water: deep weekly soaks during the first growing season; after that, no supplemental water in NE Oklahoma. The deep, fibrous root system makes established redcedars effectively drought-proof.
Mulch & fertilizer: 2–3" wood-chip mulch ring; do not fertilize.

Pruning

Eastern Redcedar tolerates light shaping but does not regenerate readily from old wood — do not shear into bare interior branches. Remove dead or damaged limbs anytime; prune for form in late winter. Watch for bagworm bags in late summer and hand-pick before larvae emerge the following spring.

Pests & diseases

Bagworms (Thyridopteryx ephemeraeformis) — the most serious pest of landscape redcedar. Hand-pick the spindle-shaped bags in fall/winter; Bt sprays in late spring catch newly hatched larvae.
Cedar-apple rust — cosmetic on the cedar (woody galls only); destructive to nearby apples. See siting warning above.
Phomopsis tip blight — minor twig dieback in wet springs.
Spider mites on stressed/sheared trees in hot dry summers.
Allergenic pollen from male trees in late winter — avoid planting male-pollen cultivars near patios or HVAC intakes.

Notable cultivars for NE Oklahoma

Cultivar	Sex / habit	Distinguishing feature	Notes for Tulsa
'Canaertii'	Female · narrow conical	Heavy crop of glaucous-blue cones, dark green foliage	Classic ornamental selection — superb wildlife tree but the cone crop makes it a strong cedar-apple rust source.
'Burkii'	Female · narrow pyramidal	Steel-blue summer foliage turning purple-bronze in winter	Reliable accent tree; same orchard-distance caveat as 'Canaertii'.
'Taylor'	Female · strictly columnar	Very narrow upright form like Italian cypress, 15–20 ft × 3 ft	Plains-bred (Nebraska); the regional substitute for Mediterranean cypress in formal landscapes. Hardy and drought-proof.
'Grey Owl'	Female · low spreading	Wide, low silver-gray mound, 3 ft × 6 ft	Foundation / mass-planting groundcover form; tough on dry banks.
'Corcorcor' (Emerald Sentinel®)	Female · dense erect crown	Glossy emerald-green foliage, prolific blue cones	Modern improvement on 'Canaertii'; dense uniform habit.
'Goldspire'	Narrow conical	Gold-tipped foliage, narrow upright form	Specimen tree; full sun for best color.
'Kobold'	Dwarf · rounded	Compact 3–4 ft mound	Rock garden / small-space conifer.

Note: 'Skyrocket', often sold as a redcedar cultivar at big-box garden centers, is actually a cultivar of the western Juniperus scopulorum (Rocky Mountain juniper) and is less reliably hardy in our humid summers.

Windbreaks & shelterbelts

For functional NE Oklahoma windbreaks, plant 2–3 staggered rows of seedling redcedar at 8–10 ft on-center, perpendicular to prevailing winter NW winds, ideally combined with an outer row of a deciduous species (Osage-orange, bur oak, or chickasaw plum) for layered structure. Established shelterbelts measurably reduce wind speed for a downwind distance of roughly 10x the mature tree height — a major factor in livestock survival, soil retention, and home heating costs across the open country north and west of Tulsa.

Cultural & Material Uses

Few American trees have as long or as broad a utilitarian record as Eastern Redcedar, and almost all of it ties back to the same remarkable property: its aromatic, lightweight, rot-resistant pinkish-red heartwood.

Fence posts: The default rot-resistant fence post of the central US for two centuries. Untreated redcedar posts routinely last 25–40 years in direct ground contact — longer than most pressure-treated alternatives.
Cedar chests & cedar-lined closets: The aromatic terpenes (alpha-cedrene, thujopsene, cedrol) repel clothes moths, which is why every "cedar chest" you have ever seen is lined with the heartwood of this species.
Pencils: Eastern Redcedar was the standard pencil wood of the US through the early 20th century. Supplies declined so sharply by the 1940s that the industry shifted to California incense-cedar (Calocedrus decurrens), which is what nearly every modern wooden pencil is made from today — but the original "cedar pencil" was this tree.
Cedarwood essential oil: Steam-distilled from heartwood shavings; used in perfumery, soaps, insect repellents, and aromatherapy. The three major terpenes (alpha-cedrene, thujopsene, cedrol) make up over 60% of the oil.
Juniper berries & gin: The blue female cones are used, often with the more traditional Juniperus communis, to flavor gin and some game-meat marinades. Use sparingly — cone oil contains podophyllotoxin in small quantities.
Bows & carved goods: Properly selected redcedar makes excellent flatbows and Native American sinew-backed bows; the wood is also the standard for the blocks (head plugs) of wooden recorders due to its low expansion when wet and mild antiseptic properties.
Indigenous uses: Smoke from burning redcedar is used ceremonially across many Native nations of the Plains and Eastern Woodlands as a purification practice. Poles of redcedar marked tribal hunting boundaries — the French traders' name for the red-painted boundary stakes gave Baton Rouge, Louisiana its name.
Cahokia Woodhenge: The pre-Columbian Mississippian timber circles at Cahokia (~1000 AD) were built of massive Eastern Redcedar logs.

Photo Reference

Juniperus virginiana foliage with mature glaucous-blue female cones — // Foliage & mature female cones · glaucous-blue waxy bloom
Wikimedia Commons

Mature Eastern Redcedar tree showing reddish shreddy bark and conical crown — // Mature tree · reddish fibrous bark · conical crown
Wikimedia Commons

Male pollen cones of Juniperus virginiana — // Male tree · tan pollen cones · late-winter allergen source
Wikimedia Commons

Sawn Eastern Redcedar log showing pale sapwood and pinkish-red aromatic heartwood — // Heartwood vs. sapwood · the source of every "cedar chest"
Wikimedia Commons

Sources & Further Reading

USDA NRCS PLANTS Database — Juniperus virginiana: plants.usda.gov/plant-profile/JUVI
USDA Forest Service Fire Effects Information System (FEIS) — Juniperus virginiana: fs.usda.gov/database/feis/plants/tree/junvir
USDA Forest Service Silvics of North America, Vol. 1 (Conifers) — Lawson, E.R. (1990), Juniperus virginiana: srs.fs.usda.gov/pubs/misc/ag_654 — juniperus/virginiana
Oklahoma State University Extension — Eastern Redcedar Encroachment in Oklahoma (NREM-2872) and the OSU Range Management series (Bidwell, Engle, et al.) on prescribed-burn prescriptions and economic impacts.
Oklahoma Forestry Services — cedar management and prescribed-fire guidance for Oklahoma rangelands.
Noble Research Institute (Ardmore, OK) — "Oklahoma Must Address Cedar Encroachment" and ongoing research on woody encroachment of southern Great Plains rangelands.
Lady Bird Johnson Wildflower Center — Native Plant Database, Juniperus virginiana: wildflower.org — JUVI
Missouri Botanical Garden Plant Finder — Juniperus virginiana cultivar profiles.
Wikipedia — Juniperus virginiana: en.wikipedia.org/wiki/Juniperus_virginiana (CC BY-SA 4.0; portions of the description, ecology, pollen and uses sections summarize Wikipedia content).
McKinley, D.C. & Blair, J.M. (2008), "Woody Plant Encroachment by Juniperus virginiana in a Mesic Native Grassland Promotes Rapid Carbon and Nitrogen Accrual", Ecosystems 11(3): 454–468.
Yoder, K.S. & Biggs, A.R., West Virginia University — Cedar-Apple Rust (Gymnosporangium juniperi-virginianae) disease cycle and management.

Photos courtesy of Wikimedia Commons contributors under their respective licenses (linked under each image).