Giant (Western) Arborvitae
For hedges, set plants 6 to 8 feet apart. For specimen plants, space 10 to 15 feet apart. Performs best in a moist and fertile but well-drained soil, either acid and alkaline in nature. The most vigorous growth will occur in full sun, however plants will tolerate light shade.
Water regularly during hot, dry periods and add a summer mulch to maintain soil moisture. Prune as needed in early spring and midsummer to maintain the desired height.