Thuja occidentalis 'Nigra'
Arborvitae
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Arborvitae (Thuja occidentalis 'Nigra') - Description
Thuja occidentalis is an evergreen coniferous tree, in the cypress family Cupressaceae, which is native to the northeast of the United States and the southeast of Canada, but widely cultivated as an ornamental plant. The species was first described by Carolus Linnaeus in 1753, and the binomial name remains current.
Arborvitae (Thuja occidentalis 'Nigra') - Blooming
Male and female cones are borne on the same tree. Males are usually ovoid, and smaller than the females, which are erect.
Arborvitae (Thuja occidentalis 'Nigra') - Growth
Monoecious, evergreen, coniferous trees. Thujas do well in summer shade in areas with hot summers. Height varies depending on variety. One species will grow to approx. 60 ft. Most species work well as hedges when grown as shrubs, such as T. occidentalis, which is small and rounded in stature. Thuja makes a nice specimen tree. Dwarf plants are nice additions to a rock garden.
Arborvitae (Thuja occidentalis 'Nigra') - Planting
Sow seeds in late winter in containers in a cold frame (for protection from winter moisture and to ensure hardiness). Can also propagate from semi-ripe cuttings in late summer.
Arborvitae (Thuja occidentalis 'Nigra') - Pest
Bark beetle, caterpillars, mites, scale insects, and weevils are common. Other frequent issues include twig dieback, mushroom root rot, needle blights, butt rot, and gray mold.
Arborvitae (Thuja occidentalis 'Nigra') - Interesting facts
Thuja is endemic to the forests of Eastern Asia and North America. Foliage can irritate the skin upon contact.
Arborvitae (Thuja occidentalis 'Nigra') - Soil and irrigation
Thujas will take little to much irrigation. Does best in deep, well-draining soil that is kept moist.
