Arborvitae ‘Green Giant’ is a popular evergreen tree cultivar known for its large size and dense foliage. It is a hybrid of two different arborvitae species, namely the Thuja plicata and Thuja standishii. ‘Green Giant’ was developed in the late 1960s by the U.S. National Arboretum.

Here are some key characteristics and features of the Arborvitae ‘Green Giant’:

1. Size: ‘Green Giant’ is renowned for its fast growth rate and impressive size. It can reach heights between 50 to 60 feet (15 to 18 meters) and can spread about 12 to 20 feet (3.5 to 6 meters) wide.
2. Shape and Foliage: It has a pyramidal or conical shape with dense, dark green foliage that remains vibrant all year round. The foliage consists of flattened sprays of scale-like leaves.
3. Cold Hardiness: ‘Green Giant’ is highly adaptable and can thrive in various climate zones. It is particularly well-suited to growing in USDA hardiness zones 5 to 8.
4. Drought Tolerance: Once established, this arborvitae cultivar exhibits good drought tolerance, making it suitable for regions with dry or arid conditions.
5. Privacy Screen and Windbreak: Due to its size and dense foliage, ‘Green Giant’ is commonly used as a privacy screen or windbreak in landscapes. It provides an excellent barrier for blocking noise and creating privacy.
6. Low Maintenance: This tree requires minimal maintenance once established. It is relatively resistant to pests and diseases, although occasional issues such as bagworms or spider mites may occur.
7. Sun Exposure: Arborvitae ‘Green Giant’ thrives in full sun to partial shade. It prefers at least six hours of direct sunlight daily for optimal growth and foliage density.
8. Soil Conditions: It prefers moist, well-drained soils but can adapt to a wide range of soil types, including clay and sandy soils. However, it is best to avoid waterlogged or excessively dry conditions.

When planting Arborvitae ‘Green Giant,’ make sure to provide adequate spacing between trees to accommodate their mature size. Regular watering during the establishment period is essential to help the tree develop a strong root system. Pruning may be necessary to maintain the desired shape or height.

Overall, Arborvitae ‘Green Giant’ is a popular choice for those seeking a fast-growing, low-maintenance evergreen tree that offers privacy and beauty to their landscape.