‘Green Giant’ is a moderately-fast growing arborvitae hybrid (T. plicata x T. standishii) that is often promoted as a disease-free substitute for Leland cypress. Trees may grow to 40 to 60 feet tall and 12 to 18 feet wide, with a dense, narrow, pyramidal habit, but can be easily kept more compact by pruning for screens or hedges. In the proper environment, trees can grow up to3 to 4 feet per year. Horizontal to slightly upright branching with sprays of aromatic, scale-like, dark green foliage. Foliage does not yellow in winter. Small, upright, light brown seed cones (to 1/2-inch long).
Best grown in fertile, well-drained soils in full sun to part shade in an area that receives regular watering. Tolerates somewhat wide range of soils and some dry conditions once established. Appreciates some light afternoon shade in our hot summer climate. For screens, plant trees 5 to 6 feet apart.