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Thuja occidentalis American arbor-vitae Evergreen tree (1 Page of 5) The Thuja occidentalis plant species is found in Eastern N. America - Nova Scotia to Georgia, west to Illinois and Minnesota. It is a member of the Cupressaceae family. Common gardeners may know the plant as American arbor-vitae. Cultivation | Propagation | General Uses Medicinal | Edible Uses Latin Name: Thuja occidentalis Common Name: American arbor-vitae Family: Cupressaceae Author: L. Known Hazards: An essential oil from the leaves is poisonous if taken in large doses[7, 65]. This plant should not be used by pregnant women[165]. Mature Height: 15 Mature Width: 5 Habitat: Swamps and cool rocky banks of streams[43], forming dense almost impenetrable forests[82, 165]. Also found on rocky soils[226]. Plants are usually found on neutral to alkaline limestone soils[226].
Cultivation Notes: Prefers a permanently moist soil[1], it is intolerant of dry soils[11]. A useful plant for very poorly-drained soils[185, 200]. The best stands in America are on well-drained soils[11]. Grows well in heavy clay soils. Succeeds in sandy soils[188] and on chalk[200].
A very hardy tree, tolerating very cold winters with temperatures down to -46°c[200, 238]. In cold weather the leaves turn brown, becoming green again in the spring[226]. It is usually slow growing and short-lived in cultivation in Britain and rarely looks thrifty[81, 185]. However, there are some good specimens in western Britain[4, 14]. Some cultivars are more healthy, 'Lutea' is growing very well in several places and 'Spiralis' is also growing well[185]. Trees live 200 - 300 years in the wild[226].
Sometimes planted as a timber tree in C. Europe[50].
Plants cannot regenerate from old wood. Pruning is not normally necessary for this species, any pruning that is carried out should be done with care[238].
The wood and the foliage are strongly aromatic[226]. The crushed leaves have a scent of apples[185].
For further Thuja occidentalis gardening information click on one of the blue links below Cultivation | Propagation | General Uses Medicinal | Edible Uses
The information above has been supplied solely via the hard work and dedication of the team at 'Plants for a Future'. View their bibliography

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