Arborvitae, Techny Overview Category: Evergreens Common Name: Arborvitae, Techny Botanical Name: Thuja occidentalis 'Techny' Sun Exposure: Part to full sun Height: 12-15 ft. Spread: 6-8 ft. See notes | Back to evergreens Notes Fast growing and dark green. Excellent for screens and tall sheared hedges. Good in sun or light shade. Very winter hardy.