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Juniperus occidentalis - Hook.f.

Common Name Western Juniper
Family Cupressaceae
USDA hardiness 5-8
Known Hazards Western juniper fruits should be eaten only in small quantities. Like other junipers, they contain volatile oils and resinous compounds that may irritate the kidneys if consumed regularly or in large amounts.
Habitats Usually found on thin rocky or sandy soils[229] on desert foothills and lower mountains[60], also on windswept peaks[82] up to elevations of 3,000 metres where they become low gnarled shrubs[229].
Range Western N. America - British Columbia to the Sierra Nevada.
Edibility Rating    (2 of 5)
Other Uses    (3 of 5)
Weed Potential No
Medicinal Rating    (2 of 5)
Care (info)
Fully Hardy Well drained soil Moist Soil Full sun
Juniperus occidentalis Western Juniper


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Juniperus occidentalis Western Juniper
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Summary

Western juniper is one of the dominant evergreen trees of the Great Basin and Pacific Northwest. It is exceptionally drought-tolerant, highly resistant to harsh weather, and can survive for centuries on rocky, nutrient-poor soils. Its twisted trunks and broad crowns are characteristic features of many western landscapes. Like all junipers, the fleshy "berries" are actually modified seed cones. They mature to a bluish color with a waxy coating and usually contain two or three seeds. Native Americans throughout its range gathered the fruits as a seasonal food and also used the wood, bark and foliage for numerous practical purposes. Unlike one-seeded juniper or alligator juniper, however, western juniper has not developed a strong reputation as a desirable food. Your supplied observations note that the fruits were not personally sampled but were expected to be highly resinous. This expectation is consistent with traditional accounts, where the fruits are generally regarded as edible but of only modest culinary value compared with sweeter juniper species. Western juniper is therefore better appreciated as an ecologically important tree and traditional resource than as a significant wild food. Taxonomic Note: This genus was formerly classified in the family Taxodiaceae. Modern classifications include it within the Cupressaceae.


Physical Characteristics

 icon of manicon of cone
Juniperus occidentalis is an evergreen Tree growing to 15 m (49ft) by 10 m (32ft) at a slow rate.
See above for USDA hardiness. It is hardy to UK zone 5. It is in leaf all year, and the seeds ripen in October. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. The plant is not self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought. The plant can tolerates strong winds but not maritime exposure.

UK Hardiness Map US Hardiness Map

Synonyms

Sabina occidentalis (Hook.) Antoine. J. pyriformis.

Plant Habitats

Woodland Garden Canopy;

Edible Uses

Edible Parts: Fruit
Edible Uses:

Only the mature fleshy seed cones are edible, and they should be consumed only in small quantities [2-3]. The fleshy outer cone scales contain sugars together with aromatic resins typical of the genus. Some Indigenous peoples traditionally ate the fruits fresh or after drying and grinding. Most fruits contain two or three seeds, reducing the proportion of edible flesh compared with one-seeded juniper. Based on our observations, western juniper fruits are expected to be strongly resinous and therefore of relatively limited food value [2-3]. Although edible, they are best regarded as an occasional emergency or supplementary food rather than a desirable fruit [2-3]. Edibility Rating: 1.5/5. Western juniper receives an overall edibility rating of 1.5 out of 5. The rating recognizes documented traditional use and the presence of edible sugars, while acknowledging the likely high resin content, limited edible flesh, and comparatively poor flavor. Until more detailed field evaluations become available, a conservative rating is appropriate. Taste, Processing & Culinary Use: Detailed flavor assessments are scarce. Your field notes indicate that western juniper fruits were not sampled but were expected to resemble the more resinous juniper species rather than the sweeter one-seeded or alligator junipers. The fleshy cone scales are likely to provide mild sweetness accompanied by pronounced resinous and evergreen flavours. Cooking is unlikely to remove these resins effectively. As with other junipers, the fruits can potentially be dried, ground, and mixed with other foods or steeped as a flavoring. Because the cones contain relatively little edible flesh surrounding two or three seeds, processing is labor-intensive. If gathered for culinary purposes, tasting fruits from individual trees before harvesting a large quantity is advisable, as flavor may vary considerably between trees. Seasonality (Phenology): Western juniper is evergreen year-round. Flowering generally occurs during spring. The fleshy cones mature in autumn, becoming blue with a pale waxy bloom. Ripe cones frequently remain attached throughout winter, extending the harvest season well beyond the initial period of maturity. Their persistence provides an important seasonal food resource for wildlife when other fruits have disappeared. Safety & Cautions: Western juniper fruits should be eaten only in small quantities. Like other junipers, they contain volatile oils and resinous compounds that may irritate the kidneys if consumed regularly or in large amounts. Individuals with kidney disease should avoid consuming juniper fruits. Medicinal or concentrated use during pregnancy is not recommended. Immature green cones contain higher concentrations of resins and should not be eaten. Leaves, bark and wood are not edible [2-3]. Harvest & Processing: Harvest mature blue cones during autumn or winter. Choose fully coloured fruits that detach easily from the branches. Remove leaves, twigs and damaged fruits before processing. Because each cone contains several hard seeds, remove them before culinary use. The fleshy portions may be dried for storage or lightly roasted before preparing infusions. Grinding dried fruits and incorporating them into other flours can dilute the resinous flavor while adding sweetness and aroma. Properly dried fruits keep well under cool, dry conditions [2-3]. Traditional Indigenous Uses: Western juniper was an important multipurpose tree throughout its native range. Several Indigenous peoples gathered the ripe fruits for food, although they generally appear to have been less highly regarded than those of sweeter juniper species. The wood served as fuel and construction material, while bark and foliage were used for shelter, bedding, cordage, and medicinal purposes. The tree also played important ceremonial roles in some cultures. Its value therefore extended well beyond its relatively modest contribution as a food plant. Nutritional Value. The fleshy cones contain carbohydrates, dietary fiber, and aromatic essential oils. Most of the edible material consists of sugars contained within the fused cone scales. The multiple seeds reduce the proportion of edible flesh. The fruits are therefore best regarded as a supplementary carbohydrate source rather than a major food [2-3]. Fruit - raw or cooked[46, 61, 105]. A thin, dry flesh[82] with a resinous flavor [2, 82]. The fruit is sweet and nutritious[2]; it can also be dried or ground into a powder and mixed with cereal flours to be made into bread[161].The cones are about 10mm in diameter, they take 2 years to mature[200].

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Analgesic  Antiseptic  Birthing aid  Blood tonic  Diuretic  Febrifuge  Laxative  Miscellany  
Odontalgic  Poultice

Western juniper was quite widely employed as a medicinal herb by a number of native North American tribes who used it to treat a variety of complaints, especially those related to the kidneys and the skin[257]. It is rarely, if at all, used in modern herbalism. The leaves are blood tonic and laxative[216]. A decoction is used in the treatment of constipation, coughs and colds[216]. An infusion of the leaves has been taken by pregnant women prior to giving birth in order to relax the muscles[257]. A poultice of the pounded moistened leaves has been applied to the jaw to treat swollen and sore gums and toothaches[257]. The berries are analgesic, blood tonic and diuretic[257]. A decoction is used to relieve the pain of menstrual cramps and to induce urination[257]. Externally, the decoction is used as a poultice on rheumatic joints[257]. The young twigs are antiseptic, blood tonic and febrifuge[257]. A decoction is used in the treatment of kidney problems, fevers, stomach aches, smallpox, influenza and haemorrhages[257]. The branches have been used in a sweat bath to ease rheumatism[257]. A poultice of the twigs has been used as a dressing on burns and as a drawing agent on boils or splinters[257]. A decoction has been used as an antiseptic wash on sores[257]. The leaves or young twigs have been burnt and the smoke inhaled to ease the pain of headaches[257].

References   More on Medicinal Uses

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Other Uses

Basketry  Beads  Fibre  Fuel  Incense  Lighting  Miscellany  Tinder  Wood

Its greatest value lies in its exceptional longevity, wildlife importance, drought tolerance, and ecological role across the dry landscapes of western North America. Western juniper is well suited to large dry landscapes and restoration plantings. Its picturesque form and exceptional longevity make it attractive for native gardens with adequate space. The bark is employed as a tinder and is also made into a slow match[216, 257]. The crushed bark was twisted into a rope, tied at intervals with yucca (Yucca species), and wrapped into a coil. The free end was set on fire and kept smoldering by blowing on it at intervals. Fire could be carried in this fashion for several hours[257]. The bark can be wound around a stick and used as a torch to provide light and carry fire to a new campsite[257]. The bark can be rubbed between the hands until it is soft and the fibers can then be woven into clothing[257]. The bark can also be rolled into rope, coiled and then sown to form sandal shoes[257]. The root fiber is used to make twined baskets[257]. The branches have been burnt as an incense and fumigant in the home[257]. The dried seeds have been used as beads or as the 'rattle' in rattles[216]. Wood - very close-grained, light, soft, exceedingly durable. It is easy to work and can be exquisitely finished. Because of its small size, however, it is mainly used for fencing, fuel[46, 61, 82, 229]. Wildlife & Ecology: Western juniper provides valuable habitat throughout its range. The fleshy cones are eaten by numerous birds and mammals, including robins, waxwings, bluebirds, coyotes, foxes, and rodents. These animals also disperse the seeds. Old trees provide nesting sites, shelter and shade for wildlife. The species is particularly valuable in arid landscapes where large evergreen trees are scarce. Its extensive root systems stabilize soils and help reduce erosion on exposed slopes.

Special Uses

Food Forest

References   More on Other Uses

Cultivation details

Western juniper grows best in full sun and well-drained soils. It tolerates rocky volcanic soils, shallow soils, gravel, and drought exceptionally well. Once established, it requires little or no supplemental irrigation. Growth is generally slow but steady. The species performs poorly in poorly drained or permanently wet soils. Habitat & Distribution: Western juniper occurs principally in California, Oregon, Washington, Idaho and northwestern Nevada. It commonly grows on lava flows, dry plateaus, rocky ridges, and open woodland between approximately 600 and 2,400 meters elevation. The species frequently dominates extensive woodland communities where few other trees can tolerate the harsh environmental conditions. Many of the oldest individuals occur on shallow rocky soils where competition is limited. Cultivation: Western juniper is well suited to large dry landscapes and restoration plantings. Its picturesque form and exceptional longevity make it attractive for native gardens with adequate space. Young trees benefit from occasional watering during establishment but require little maintenance thereafter. Pruning is generally unnecessary except to remove damaged branches. The species performs best with excellent drainage and minimal irrigation. Pollinators: Western juniper is wind pollinated. Male trees release pollen during spring, while female trees produce the fleshy seed cones. The species provides little direct value for insect pollinators because it lacks nectar-producing flowers. Its reproduction depends almost entirely upon airborne pollen. Identification: Western juniper is a medium-sized evergreen tree with fibrous grey to reddish-brown bark that becomes deeply furrowed with age. The foliage consists of tiny overlapping scale-like leaves closely pressed against the twigs. The bluish fleshy seed cones measure approximately 8–10 mm across and usually contain two or three seeds. Old trees frequently develop broad rounded crowns and twisted trunks. Within its range, the combination of blue waxy cones, scale-like foliage, deeply furrowed bark, and dry upland habitat makes mature trees relatively straightforward to identify. Succeeds in most soils, including chalk, so long as they are well-drained [1, 11], preferring a neutral or slightly alkaline soil[11]. Established plants are drought-tolerant and succeed in hot, dry positions[200]. Plants are slow-growing, though they can live for 3000 years in the wild[200, 229]. They are much shorter-lived in cultivation[200] and grow better in dry areas with hot summers[200]. Western Britain is generally to cool and wet for this species to thrive[200]. Plants are usually monoecious but are sometimes dioecious. Male and female plants must usually be grown if seed and fruit is required. The fruit takes two summers to ripen[229]. Plants are resistant to honey fungus[88]. In garden design, along with a plant's above-ground architecture, root structure considerations help choose plants that work together for optimal soil requirements, including nutrients and water. The root pattern is flat, with shallow roots spreading near the soil surface [2-1]. Western juniper, Juniperus occidentalis Hook., belongs to the cypress family (Cupressaceae) and the genus Juniperus. Common names include western juniper and Sierra juniper. It is native to California, Oregon, Washington, Idaho and northwestern Nevada, where it is an important tree of dry mountains, lava plains and rocky uplands. Western juniper is generally hardy in USDA Hardiness Zones 5–8. Mature trees commonly reach 8–15 meters tall, although old specimens may exceed 20 meters. Mature crowns usually spread 5–10 metres. The species is extremely long-lived, with some individuals surviving for well over 1,000 years.

References   Carbon Farming Information and Carbon Sequestration Information

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Plant Propagation

The seed requires a period of cold stratification. The seed has a hard seedcoat and can be very slow to germinate, requiring a cold period followed by a warm period and then another cold spell, each of 2 - 3 months duration[78, 81]. Soaking the seed for 3 - 6 seconds in boiling water may speed up the germination process[11]. The seed is best sown as soon as it is ripe in a cold frame. Some might germinate in the following spring, though most will take another year. Another possibility is to harvest the seed 'green' (when the embryo has fully formed but before the seedcoat has hardened). The seedlings can be potted up into individual pots when they are large enough to handle. Grow on in pots until large enough, then plant out in early summer. When stored dry, the seed can remain viable for several years[1]. Cuttings of mature wood, 5 - 10cm with a heel, September/October in a cold frame. Plant out in the following autumn[1, 78]. Layering in September/October. Takes 12 months[78].

Other Names

If available other names are mentioned here

Western juniper and Sierra juniper.

Native Range

NORTHERN AMERICA: United States (Idaho (west), Oregon, Washington (south), California (north), Nevada (northwest))

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it's worth checking.

Western juniper has low weed potential in cultivation. Natural regeneration occurs slowly through bird-dispersed seed. Within parts of its native range, western juniper has expanded into former grasslands following reduced fire frequency and changes in grazing practices. While this can create management challenges locally, it represents ecological succession rather than invasive behavior outside its natural distribution. For PFAF purposes, its weed potential is best rated 2/5 (low).

Conservation Status

IUCN Red List of Threatened Plants Status : Juniperus occidentalis is listed as Least Concern.

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Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Readers comment

Mark Cobb   Fri May 23 2008

West Coast Juniper The most extensive Western Juniper site around

   Sep 25 2012 12:00AM

I am not an expert on any species of plant, I am only relaying information that was given to me by other people and my direct observations. Claims that Juniperus Occidentalis can live to 3000 years have been largely discredited and are based on extrapolation of the age of the Bennett Juniper rather than proper measurement of any specimen. I believe that the oldest living Juniperus Occidentalis dated by counting tree rings is about 1500 years old, and is growing at the top of a cliff across the highway from my property (Scotty Strachan at UN Reno, unpublished data). Older trees may exist, but have not been dated. Older dead trees exist; that is trees that were more than 1500 years old at the time of death, but none are close to 3000 years old at the time of death. The size and age of the tree are poorly correlated, with very small specimens often having the greatest age. This makes selection of trees to sample difficult. A dead tree specimen collected from the cliff noted above has about 1600 rings but measures only about 18 inches in diameter, for example. In comparison, Scotty dated a live tree on my side of the road at 760+ years old, but it is about 60 inches in diameter (maybe a little more). Regarding the above growing environment: Winter lows to -10F, rarely below -5F. Summer highs to 90F, rarely above 80F. The dew point is usually about 20F (or ambient, whichever is less), any time of the year. The above location is about 2400 meters elevation. The combination of the two factors above yields intense sunlight.* I have not observed these trees growing anywhere that does not have such intense sunlight. Severe freeze-thaw cycling in the spring does not affect these trees. It kills or damages nearly everything else. At the above location there is about 27 inches of precipitation per year, mostly as snow in the winter with only about 2-3 inches in summer as rain. It prefers extremely well drained granitic sandy soil. Almost none grow in the nearby field of decomposed andesitic soil and most (all?) that are growing in the andesite are in small out cropings of granite within the field.** Most old trees show significant lightning damage and a strip bark growth habit. * Normal sunlight at sea level averages 1000W/sq meter. Sunlight at the above location averages about 1200W/sq meter in summer. Sunlight in space above earth is about 1350 W/sq meter. ** A large volcano encased a much older granite formation in Andesite about 9 million years ago. The oldest trees grow on the granite side of the currently exposed granite-andesite contact zone. Scotty notes that some old-looking trees exist on the far side of the old caldera from the above site, but has not had time to date any of them. M.L

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