Juniperus virginiana, also known as red cedar, eastern red cedar, Virginian juniper, eastern juniper, red juniper, and other local names, is a species of juniper native to eastern North America from southeastern Canada to the Gulf of Mexico and east of the Great Plains. Further west it is replaced by the related Juniperus scopulorum (Rocky Mountain juniper) and to the southwest by Juniperus ashei (Ashe juniper).
|Juniperus virginiana incorporated into a golf course in northern Virginia|
|Section:||Juniperus sect. Sabina|
|Natural distribution of varieties:|
J. virginiana var. virginiana (green)
and J. virginiana var. silicicola (red)
Juniperus virginiana is a dense slow-growing coniferous evergreen tree that may never become more than a bush on poor soil, but is ordinarily from 5–20 metres (16–66 feet) tall, with a short trunk 30–100 centimetres (12–39 inches) in diameter, rarely to 27 m (89 ft) in height and 170 cm (67 in) in diameter. The oldest tree reported, from West Virginia, was 940 years old. The bark is reddish-brown, fibrous, and peels off in narrow strips. The leaves are of two types; sharp, spreading needle-like juvenile leaves 5–10 millimetres (3⁄16–3⁄8 in) long, and tightly adpressed scale-like adult leaves 2–4 mm (1⁄16–3⁄16 in) long; they are arranged in opposite decussate pairs or occasionally whorls of three. The juvenile leaves are found on young plants up to 3 years old, and as scattered shoots on adult trees, usually in shade. The seed cones are 3–7 mm (1⁄8–1⁄4 in) long, berry-like, dark purple-blue with a white wax cover giving an overall sky-blue color (though the wax often rubs off); they contain one to three (rarely up to four) seeds, and are mature in 6–8 months from pollination. The juniper berry is an important winter food for many birds, which disperse the wingless seeds. The pollen cones are 2–3 mm (1⁄16–1⁄8 in) long and 1.5 mm (1⁄16 in) broad, shedding pollen in late winter or early spring. The trees are usually dioecious, with pollen and seed cones on separate trees, yet some are monoecious.
- Juniperus virginiana var. virginiana is called eastern juniper / redcedar. It is found in eastern North America, from Maine, west to southern Ontario and South Dakota, south to northernmost Florida and southwest into the post oak savannah of east-central Texas. Cones are larger, 4–7 mm (3⁄16–1⁄4 in); scale leaves are acute at apex and bark is red-brown.
- Juniperus virginiana var. silicicola (Small) E.Murray (syn. Sabina silicicola Small, Juniperus silicicola (Small) L.H.Bailey) is known as southern or sand juniper / redcedar. Its variety name means "flint-dweller", from Latin silex and -cola. Habitat is along the Atlantic and Gulf coasts from the extreme southeastern corner of Virginia, south to central Florida and west to southeast Texas. Cones are smaller, 3–4 mm (1⁄8–3⁄16 in); scale leaves are blunt at apex and the bark is orange-brown. It is treated by some authors at the lower rank of variety, while others treat it as a distinct species.
Eastern juniper is a pioneer species, which means that it is one of the first trees to repopulate cleared, eroded, or otherwise damaged land. It is unusually long lived among pioneer species, with the potential to live over 900 years. It is commonly found in prairies or oak barrens, old pastures, or limestone hills, often along highways and near recent construction sites. It is an alternate host for cedar–apple rust, an economically significant fungal disease of apples, and some management strategies recommend the removal of J. virginiana near apple orchards
In many areas it is considered an invasive species, even if native. It is fire-intolerant, and was previously controlled by periodic wildfires. Low branches near the ground burn and provide a ladder that allows fire to engulf the whole tree. Grasses recover quickly from low severity fires that are characteristic of prairies that kept the trees at bay. With the urbanization of prairies, the fires have been stopped with roads, plowed fields, and other fire breaks, allowing J. virginiana and other trees to invade. Trees are destructive to grasslands if left unchecked, and are actively being eliminated by cutting and prescribed burning. The trees also burn very readily, and dense populations were blamed for the rapid spread of wildfires in drought stricken Oklahoma and Texas in 2005 and 2006.
Eastern juniper benefits from increased CO2 levels, unlike the grasses with which it competes. Many grasses are C4 plants that concentrate CO2 levels in their bundle sheaths to increase the efficiency of RuBisCO, the enzyme responsible for photosynthesis, while junipers are C3 plants that rely on (and may benefit from) the natural CO2 concentrations of the environment, although they are less efficient at fixing CO2 in general.
Damage done by J. virginiana includes outcompeting forage species in pastureland. The low branches and wide base occupy a significant portion of land area. The thick foliage blocks out most light, so few plants can live under the canopy. The needles that fall raise the pH of the soil, making it alkaline, which holds nutrients such as phosphorus, making it harder for plants to absorb them. However, studies have found that Juniperus virginiana forests that replace grasslands have a statistically insignificant decrease to a significant increase in levels of soil nitrogen. J. virginiana forests have higher overall nitrogen use efficiency (NUE), despite the common grassland species Andropogon gerardi having a far higher NUE during photosynthesis (PNUE). The forests store much greater amounts of carbon in both biomass and soil, with most of the additional carbon stored aboveground. There is no significant difference in soil microbial activity.
Cedar waxwings are fond of the "berries" of these junipers. It takes about 12 minutes for their seeds to pass through the birds' guts, and seeds that have been consumed by this bird have levels of germination roughly three times higher than those of seeds the birds did not eat. Many other birds (from bluebirds to turkeys) and many mammals also consume them.
The pollen of Eastern Red Cedar (Juniperus virginiana) is a known allergen. This variety is native to Eastern North America, north of Mexico, with the pollen releasing at various points in the Spring, variable by latitude and elevation.
The fragrant, finely grained, soft, brittle, very light, pinkish to brownish red heartwood is very durable, even in contact with soil. Because of its resistance to decay, fence posts are fashioned from the wood. Moths avoid the aromatic wood, and therefore it is in demand as lining for clothes chests and closets, which are often denominated "cedar closets" and "cedar chests". If correctly prepared, excellent English longbows, flatbows, and Native American sinew-backed bows can be made from it. It is marketed as "eastern redcedar" and "aromatic cedar". The best portions of the heartwood are one of the few woods that are suitable for making pencils, however the supply had so diminished by the 1940s that the wood of the incense-cedar largely replaced it.
Part of the commercially available cedar oil is produced by steam distillation from wood shavings, it contains a wide variety of terpenes. The tree major components alpha-Cedrene, Thujopsene and Cedrol are more than 60% of the essential oil. The fruits also yield an essential oil which contains mostly D-Limonene.
Native American tribes have historically used poles of juniper wood to demarcate agreed tribal hunting territories. French traders named Baton Rouge, Louisiana, which denotes "red stick", from the reddish color of these poles. Some nations continue to use it ceremoniously.
The Cahokia Woodhenge series of timber circles that the pre-Columbian Mississippian culture in western Illinois erected were constructed of massive logs of eastern juniper. One iteration of the such a circle, Woodhenge III, which is thought to have been constructed circa 1000 BC, had 48 posts in the circle of 410 feet (120 m) in diameter and a 49th pole in the center.
Among many Native American cultures, the smoke of burning eastern juniper is believed to expel evil spirits prior to conducting a ceremony, such as a healing ceremony.
During the Dust Bowl drought of the 1930s, the Prairie States Forest Project encouraged farmers to plant shelterbelts, i. e. wind breaks, of eastern juniper throughout the Great Plains of the USA. The trees thrive in adverse conditions. Tolerant of both drought and cold, they grow well in rocky, sandy, and clayey soils. Competition between individual trees is minimal, and therefore they can be closely planted in rows, in which situation they still grow to full height, creating a solid windbreak in a short time.
A number of cultivars have been selected for horticulture, including 'Canaertii' (narrow conical; female) 'Corcorcor' (with a dense, erect crown; female), 'Goldspire' (narrow conical with yellow foliage), and 'Kobold' (dwarf). Some cultivars previously listed under this species, notably 'Skyrocket', are actually cultivars of J. scopulorum.
This is the most widely used wood for making blocks for recorders. There are numerous properties that it possesses that make it uniquely suitable for this, such as good moisture absorption, low expansion when wet (so it does not crack the recorder head), and mild antiseptic properties.
- Farjon, A. (2013). "Juniperus virginiana". IUCN Red List of Threatened Species. 2013: e.T42257A2967510. doi:10.2305/IUCN.UK.2013-1.RLTS.T42257A2967510.en. Retrieved 12 November 2021.
- Adams, Robert P. (1993). "Juniperus virginiana, Sabina virginiana". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 2. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- USDA, NRCS (n.d.). "Juniperus virginiana". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 22 January 2016.
- BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
- Farjon, A. (2005). Monograph of Cupressaceae and Sciadopitys. Royal Botanic Gardens, Kew. ISBN 1-84246-068-4
- Earle, Christopher J., ed. (2018). "Juniperus virginiana". The Gymnosperm Database.
- Adams, R. P. (2004). Junipers of the World. Trafford. ISBN 1-4120-4250-X
- "Juniperus virginiana". Eastern OLDLIST. Retrieved 13 December 2015.
- "Virginia's Timber Industry — An Assessment of Timber Product Output and Use, 2007" (PDF). Dof.virginia.gov. Retrieved 4 August 2018.
- Barlow, Virginia (Winter 2004). "Species in the Spotlight: Eastern Redcedar, Juniperus virginiana". Northern Woodlands. Center for Northern Woodlands Education. 11 (43): 37. Retrieved July 29, 2009.
- West Virginia University: Cedar-Apple Rust, Gymnosporangium juniperi-virginianae Archived 2007-11-12 at the Wayback Machine
- "Forest Plan" (PDF). fs.fed.us.
- Noble Research Institute: News Release
- "Wildfires Rip Through Oklahoma". CNN. January 1, 2006. Retrieved April 11, 2007.
- McKinley, Duncan C.; Blair, John M. (1 April 2008). "Woody Plant Encroachment by Juniperus virginiana in a Mesic Native Grassland Promotes Rapid Carbon and Nitrogen Accrual". Ecosystems. 11 (3): 454–468. doi:10.1007/s10021-008-9133-4. S2CID 23911766.
- Bekele, Asfaw; Hudnall, Wayne. H. (1 April 2005). "Response of soil δ15N and nutrients to eastern red cedar (Juniperus virginiana) encroachment into a relict calcareous prairie". Plant and Soil. 271 (1): 143–155. doi:10.1007/s11104-004-2297-6. S2CID 37204504.
- Norris, Mark D.; Blair, John M.; Johnson, Loretta C. (October 2007). "Altered Ecosystem Nitrogen Dynamics as a Consequence of Land Cover Change in Tallgrass Prairie". The American Midland Naturalist. 158 (2): 432–445. doi:10.1674/0003-0031(2007)158[432:AENDAA]2.0.CO;2.
- "Eastern Red-Cedar Species Description". Pollen Library. Archived from the original on 1 Nov 2019. Retrieved 4 April 2022.
- Adams, R. P. (1991). "Cedar Wood Oil — Analyses and Properties". Essential Oils and Waxes. Modern Methods of Plant Analysis. Vol. 12. pp. 159–173. doi:10.1007/978-3-642-84023-4_8. ISBN 978-3-642-84025-8.
- Adams, Robert P. (January 1987). "Investigation ofJuniperus species of the United States for new Sources of Cedarwood Oil". Economic Botany. 41 (1): 48–54. doi:10.1007/BF02859346. S2CID 39335597.
- Zhang, Kai; Yao, Lei (May 2018). "The anxiolytic effect of Juniperus virginiana L. essential oil and determination of its active constituents". Physiology & Behavior. 189: 50–58. doi:10.1016/j.physbeh.2018.01.004. PMID 29326032. S2CID 4620958.
- Samoylenko, Volodymyr; Dunbar, D. Chuck; Gafur, Md. Abdul; Khan, Shabana I.; Ross, Samir A.; Mossa, Jaber S.; El-Feraly, Farouk S.; Tekwani, Babu L.; Bosselaers, Jan; Muhammad, Ilias (December 2008). "Antiparasitic, nematicidal and antifouling constituents from Juniperus berries". Phytotherapy Research. 22 (12): 1570–1576. doi:10.1002/ptr.2460. PMID 19067375. S2CID 10379153.
- Gawde, Archana J.; Cantrell, Charles L.; Zheljazkov, Valtcho D. (September 2009). "Dual extraction of essential oil and podophyllotoxin from Juniperus virginiana". Industrial Crops and Products. 30 (2): 276–280. doi:10.1016/j.indcrop.2009.05.005.
- Cushman, Kent E.; Maqbool, Muhammad; Gerard, Patrick D.; Bedir, Ebru; Lata, Hemant; Moraes, Rita M. (May 2003). "Variation of Podophyllotoxin in Leaves of Eastern Red Cedar (Juniperus virginiana)". Planta Medica. 69 (5): 477–478. doi:10.1055/s-2003-39707. PMID 12802737.
- Iseminger, William R. "The Skywatchers of Cahokia". Mexicolore. Retrieved 2017-12-19.
- Lyon, William S. (1998). Encyclopedia of Native American Healing. W.W. Norton & Company, Inc. p. 173. ISBN 0-393-31735-8.
- "USDA Fact Sheet" (PDF). ufl.edu.
- Welch, H., & Haddow, G. (1993). The World Checklist of Conifers. Landsman's. ISBN 0-900513-09-8.[page needed]
- Lawson, Edwin R. (1990). "Juniperus virginiana". In Burns, Russell M.; Honkala, Barbara H. (eds.). Conifers. Silvics of North America. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA). Vol. 1 – via Southern Research Station.
- Interactive Distribution Map of Juniperus virginiana