Green Giant Arborvitae (Thuja x ) typically reaches 30-50 ft tall, 10-15 ft wide with a pyramidal form. It grows at a fast rate and performs well in USDA Zones 5-8. With dense, evergreen foliage and a naturally narrow habit, this selection is a top choice for hedges, privacy screens, or foundation plantings. Low-maintenance and dependable year-round.