Green Giant Arborvitae - THUJA x 'Green Giant'. 30-40' tall, 15-20' spread, full to part sun. Evergreen. The unique leaf pattern and broad pyramidal habit makes for a gorgeous focal point in the landscape. When planted 5-6' apart this 'Green Giant' creates the perfect dense privacy screens or windbreak. In the proper environment, trees can add up to 3-4' of growth per year. Zones 5-8. Potted in 3" pot.