'Green Giant' Arborvitae, Thuja plicata; Grows to 30' to 40' under landsape conditions, spreads to 5 to 8 feet. Fast grower, 3 feet per year while tree is young (depends on water and fertilizer availability). Full sun is best, tree will not be vigorous in too much shade. Tolerates poor soil conditions, variable pH, requires adequate drainage, will tolerate drought conditions after tree is established. Excellent screening tree, not as large as leyland cypress.