Boone County Arboretum
9190 Camp Ernst Road
Union, Kentucky 41091
Phone: (859) 384-4999
Fax: (859) 384-6888
arboretum@boonecountyky.org

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Cultural Details for Thuja occidentalis 'Nigra'

Common Name:
Dark Eastern (American) Arborvitae

Growth Rate:
slow to medium

Average Mature Height:
20-30'

Average Mature Width:
4-5''

Flower Details:
Monoecious, terminal, solitary

Fruit Details:
cones oblong, 0.33-0.5" long, light brown, scales 8-10, usually 4 of which are fertile.

Fall Color:
Dark green foliage persists through winter.

Bark Details:
Grayish brown to reddish brown, 0.25-0.33" thick, fibrous, forming a close netwoork of connecting ridges and shallow furrows.

Disease / Insect Problems or Resistance:
Subject to bagworm, heart rot, leaf iner, spider mites, and deer browsing.

Native Habitat:
Species native to eastern North America

Other Features:
Useful as a specimin or accent planting. Also good for hedges and shelter-belts.

Culture and Care:
Requires a deep, well-drained soil (thrives in marshy loam), tolerates limestone soils. Plant in full sun in areas with considerable atmospheric moisture. Susceptable to strong wind, snow, and Ice. Will take considerable heat and drought once established.

This plant was blooming:

Plantings of this cultivar at Boone County Arboretum:
5610, 5620, 5670

    The information on this page may have come from one or more of the following sources:
  • Dirr, Michael. Manual of Woody Landscape Plants. Stipes Publishing. 1998.
  • Hightshoe, Gary L. Native Trees, Shrubs, and Vines for Urban and Rural America. John Wiley & Sons. 1988.
  • North Carolina Extension Plant Fact Sheets. www.ces.ncsu.edu
  • University of Connecticut Plant Database. www.hort.uconn.edu