Platycladus orientalis
Oriental Arborvitae
Cupressaceae
ExpandHabitat
- native to Korea, Manchuria and Northern China
- zone 6, or zone 5 in protected sites
Habit and Form
- an evergreen
- a large shrub or small tree
- dense, conical shape
- 18' to 25' tall, 10' wide
- slow growing
- medium texture
Summer Foliage
- leaves are triangular scales with a blunt point
- scales are approx. .05" to .1"
- scales have a distinct grooved pattern on the back
- scales are closely pressed to stem sprays, however unlike other similar species the scales are not closely pressed to the stem tip
- medium green to yellowish color
- leaves emit an odor when bruised
- branchlets are arranged in vertical planes
Autumn Foliage
- evergreen no fall color
- can discolor in harsh winters
Flowers
- not ornamentally important
- monoecious
Fruit
- fleshy, glaucous blue-green color when developing
- woody horn-like cone when mature
- medium-brown color
Bark
- shredding
- brown to gray-brown color
Culture
- transplants well
- tolerant of most conditions, except does poorly in boggy sites
- best in full sun; tolerates light shade
- avoid planting where it will be exposed to harsh winter winds
- pH adaptable
Landscape Use
- specimens
- hedges
- mass plantings
- screens
Liabilities
- spider mites
- bagworm
- ice and snow build-up can break branches
ID Features
- bruised leaves emit odor
- branchlets arranged in a vertical pattern
- hard horn-like cones
- tends to keep green color in winter
- shredding gray-brown bark
- distinct groove of back of scales
Propagation
- by seed
Cultivars/Varieties
Dwarf forms include: 'Aurea Nana', a dense globular plant to 10' tall with yellow-green foliage; 'Baker', a dense conical plant to 8' tall; 'Compacta', a compact pyramidal form useful for formal applications; 'Juniperoides', a rounded 3' tall form with blue-gray needles; 'Westmont', a slow-growing bun to 2' tall and wide with yellow-tipped green leaves.
Yellow-foliaged forms include: 'Conspicua' (probably the true "Berckmann's Golden Biota"), a large, upright-growing conical plant with vertical branches of yellow foliage; 'Filiformis Aurea', an upright oval shrub with stringy yellow branchlets.