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| Eastern Arborvitae is very widely used as an ], particularly for screens and ]s. Over 300 ]s have been selected and named for garden use; some of the commoner in the horticultural trade include 'Degroot's Spire', 'Ellwangeriana', 'Hetz Wintergreen', 'Lutea', 'Rheingold', 'Smaragd' (a.k.a. 'Emerald Green'), 'Techny', and 'Wareana'. It was introduced into ] as early as 1540 and today is widely cultivated there, especially in parks and cemeteries. | Eastern Arborvitae is very widely used as an ], particularly for screens and ]s. Over 300 ]s have been selected and named for garden use; some of the commoner in the horticultural trade include 'Degroot's Spire', 'Ellwangeriana', 'Hetz Wintergreen', 'Lutea', 'Rheingold', 'Smaragd' (a.k.a. 'Emerald Green'), 'Techny', and 'Wareana'. It was introduced into ] as early as 1540 and today is widely cultivated there, especially in parks and cemeteries. | ||
| Thuja is an ingredient used in herbal and homeopathic remedies for a variety of ailments in ].<ref name="Naser et al. 2005">Naser, B. and others. "Thuja occidentalis (Arbor vitae): A Review of its Pharmaceutical, Pharmacological and Clinical Properties", in <i>Evidence Based Complementary and Alternative Medicine</i>: 2005 Mar;2(1):69-78. Epub 2005 Feb 9. PMID: 15841280. Summary .</ref> The oils of ''Thuja occidentalis'' can be found in ] medications that claim to eliminate warts, including the ]. No scientific evidence proves this claim.<ref>http://www.cancer.org/docroot/ETO/content/ETO_5_3X_Thuja.asp |
Thuja is an ingredient used in herbal and homeopathic remedies for a variety of ailments in ].<ref name="Naser et al. 2005">Naser, B. and others. "Thuja occidentalis (Arbor vitae): A Review of its Pharmaceutical, Pharmacological and Clinical Properties", in <i>Evidence Based Complementary and Alternative Medicine</i>: 2005 Mar;2(1):69-78. Epub 2005 Feb 9. PMID: 15841280. Summary .</ref> The oils of ''Thuja occidentalis'' can be found in ] medications that claim to eliminate warts, including the ]. No scientific evidence proves this claim.<ref>http://www.cancer.org/docroot/ETO/content/ETO_5_3X_Thuja.asp</ref> | ||
| The foliage of thuja is rich in ], and was used by ] and early European explorers to prevent ].<ref>http://www.fs.fed.us/database/feis/plants/tree/thuocc/all.html</ref> | The foliage of thuja is rich in ], and was used by ] and early European explorers to prevent ].<ref>http://www.fs.fed.us/database/feis/plants/tree/thuocc/all.html</ref> | ||
Revision as of 05:45, 23 January 2008
| Thuja occidentalis | |
|---|---|
| |
| Thuja occidentalis foliage and cones | |
| Conservation status | |
 Least Concern | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Pinales |
| Family: | Cupressaceae |
| Genus: | Thuja |
| Species: | T. occidentalis |
| Binomial name | |
| Thuja occidentalis L. | |
Thuja occidentalis, a species of thuja, is an evergreen coniferous tree in the cypress family Cupressaceae, native to the northeastern U.S. and southeastern Canada, from central Saskatchewan east to New Brunswick, and south to eastern Tennessee in the Appalachian Mountains.
Unlike the closely related Thuja plicata (Western Redcedar), it is only a small tree, to 10-20 m tall and 0.4 m trunk diameter (exceptionally to 30 m tall and 1.6 m diameter). The bark is red-brown, furrowed and peels in narrow, longitudinal strips. The foliage forms in flat sprays with scale-like leaves 3-5 mm long. The cones are slender, yellow-green ripening brown, 10-15 mm long and 4-5 mm broad, with 6-8 overlapping scales.
It is known as Eastern Arborvitae, American Arborvitae, Techny Arborvitae, or just Arborvitae, the last particularly in the horticultural trade. Other names by which it is known include Northern Whitecedar, Eastern Whitecedar (sometimes split into two words as "White Cedar", though this causes confusion, as it is not a cedar), and the colloquial "swamp-cedar". Thuja occidentalis should not be confused with the Chinaberry, Melia azedarach, an Australian deciduous tree also known as the White Cedar.
Ecology
Thuja occidentalis grows naturally in wet forests, being particularly abundant in swamps where other larger and faster-growing trees cannot compete successfully. It also occurs on other sites with reduced tree competition such as cliffs. Although not currently listed as endangered, wild Thuja occidentalis populations are threatened in many areas by the very high deer numbers encouraged by hunting associations; deer find the soft evergreen foliage a very attractive winter food, and strip it rapidly. The largest known is 34 m tall and 175 cm diameter, in South Manitou Island within Leelanau County, Michigan. It can be a very long-lived tree in certain conditions, with notably old specimens growing on cliffs where they are inaccessible to deer and wildfire; the oldest known living specimen is just over 1,000 years old, but a dead specimen with over 1,500 growth rings has been found. These very old trees are, despite their age, small and stunted due to the difficult growing conditions.
Uses
Eastern Arborvitae is very widely used as an ornamental tree, particularly for screens and hedges. Over 300 cultivars have been selected and named for garden use; some of the commoner in the horticultural trade include 'Degroot's Spire', 'Ellwangeriana', 'Hetz Wintergreen', 'Lutea', 'Rheingold', 'Smaragd' (a.k.a. 'Emerald Green'), 'Techny', and 'Wareana'. It was introduced into Europe as early as 1540 and today is widely cultivated there, especially in parks and cemeteries.
Thuja is an ingredient used in herbal and homeopathic remedies for a variety of ailments in alternative medicine. The oils of Thuja occidentalis can be found in organic medications that claim to eliminate warts, including the Human papillomavirus. No scientific evidence proves this claim.
The foliage of thuja is rich in Vitamin C, and was used by Native Americans and early European explorers to prevent scurvy.
White cedar is the preferred wood for the structural elements, such as ribs and planking, of birchbark canoes and the planking of wooden canoes.
References
- Naser, B. and others. "Thuja occidentalis (Arbor vitae): A Review of its Pharmaceutical, Pharmacological and Clinical Properties", in Evidence Based Complementary and Alternative Medicine: 2005 Mar;2(1):69-78. Epub 2005 Feb 9. PMID: 15841280. Summary .
- http://www.cancer.org/docroot/ETO/content/ETO_5_3X_Thuja.asp
- http://www.fs.fed.us/database/feis/plants/tree/thuocc/all.html
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A trimmed Eastern Arborvitae hedge
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Leaves on an Eastern Arborvitae
