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Thuja occ. ‘Nigra’:. Grow in average, medium moisture, well-drained soils in full sun to part shade. Somewhat wide range of soil tolerance, but prefers moist, neutral to alkaline, well-drained loams. Intolerant of dry conditions. Best in full sun, but generally appreciates some light afternoon shade in hot summer climates. Avoid full shade where foliage density will substantially decrease. Avoid exposed, windy sites.
Thuja occidentalis, commonly known as American arborvitae, Eastern arborvitae, Eastern white cedar or Northern white cedar, is a dense, conical to narrow-pyramidal (sometimes maturing to broad-pyramidal), often single-trunked, evergreen tree that is native to eastern and central Canada south to northern Illinois, Ohio and New York with scattered populations further south in the Appalachians to North Carolina. ‘Nigra’ is a conical cultivar that will grow to 20-30′ tall and to 5-10′ wide. It features flattened sprays of dark green foliage that retain good green color throughout the year including winter. Seed cones are not particularly showy. Zones 3 to 7.