Wangsgard said the two her office recommends — the dark green American arborvitae and the Columnar oriental arborvitae — do well in the Washington area.
Washington Post(Jun 07, 2014)
n small evergreen of eastern North America having tiny scalelike leaves on flattened branchlets
Syn|Hyper
Thuja occidentalis, northern white cedar, white cedar
arborvitae
any of several Asian and North American conifers of the genera Thuja and Thujopsis