American arborvitae

Thuja occidentalis 'Emerald'

Photo/Illustration: 
Steve Aitken
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American arborvitae (Thuja occidentalis 'Emerald')
THOO-yah oks-ee-den-TAL-is
Synonyms:  'Smaragd'
Genus:  Thuja

This cultivar is a compact, evergreen, pyramidal tree that retains its glossy, bright green foliage throughout the year, making it a valuable hedge plant or specimen.

Noteworthy Characteristics: 

This plant tolerates a wide range of soils and likes humid weather with regular rain. The foliage becomes less dense if planted in too much shade.

Care: 

This cultivar is easily grown in average, well-drained soil in full sun to part shade. Water deeply in hot and dry weather and mulch the root zone. Prune in early spring before onset of new growth. If grown as a hedge, trim in spring and late summer if desired. Keep trained to a single leader to avoid ice and snow damage.

Propagation: 

Insert semi-ripe cuttings in late summer.

Problems: 

Caterpillars, bark beetles, weevils, mites, and scale insects are common, as are butt rott, twig dieback, Botrytis, mushroom root rot, and needle blights.

Overview

Height
6 ft. to 10 ft.
Spread
3 ft. to 6 ft.
Growth Habit
Clumps
Growth Pace
Moderate Grower
Light
Full Sun to Part Shade
Moisture
Medium Moisture
Maintenance
Low
Characteristics
Native,
Showy Foliage
Foliage Color
Evergreen
Uses
Screening,
Specimen Plant/Focal Point
Seasonal Interest
Winter Interest
Type
Trees

Thuja occidentalis 'Emerald'