The choice between green giant arborvitae and thuja often arises when designing a lasting landscape. While these evergreen conifers share a similar role as screening trees, their long-term performance can vary significantly. Understanding the specific characteristics of each cultivar ensures the selected specimen thrives within the intended environment.
Defining the Key Players
To compare green giant arborvitae vs thuja effectively, one must first clarify the terminology. "Green Giant" is a specific patented cultivar of Western Red Cedar, known scientifically as Thuja plicata 'Green Giant'. Conversely, the term "thuja" typically refers to the genus as a whole, which includes species like Thuja occidentalis (Eastern White Cedar) and their respective cultivars. This distinction is vital because the care requirements and growth habits of a single cultivar differ from the general traits of the entire genus.
Growth Rate and Final Dimensions
When evaluating green giant arborvitae vs thuja, speed and size are primary considerations. The 'Green Giant' cultivar is celebrated for its vigorous growth, often adding up to three feet of height annually until it reaches maturity. It typically achieves a mature height of 40 to 60 feet with a spread of 12 to 15 feet, creating an imposing vertical presence. In contrast, many species classified simply as thuja, such as Thuja occidentalis 'Smaragd', grow at a slower pace and max out at a more modest 15 to 20 feet tall, making them suitable for tighter residential spaces.
Foliage and Aesthetic Qualities
The visual impact of these trees is another critical factor in the green giant arborvitae vs thuja debate. The 'Green Giant' lives up to its name with vibrant, deep green foliage that maintains its color year-round, even in harsh winter conditions. The scale-like leaves are soft to the touch and emit a pleasant fragrance when crushed. While other thuja varieties offer attractive textures and hues—ranging from bright yellow-green to steely blue—the dense, uniform canopy of the Green Giant is specifically bred for maximum screening and ornamental value.
Environmental Tolerance and Soil Needs
Durability against environmental stress highlights a key difference in the green giant arborvitae vs thuja comparison. The 'Green Giant' hybrid exhibits remarkable resilience against drought, heat, and humidity once established, reducing maintenance demands. It is also highly resistant to common pests like bagworms and diseases such as blight. While standard thuja species are adaptable, they are generally more susceptible to winter burn in exposed, windy locations and require consistently moist, well-drained soil to prevent root rot.
Landscape Applications and Maintenance
Selecting between these evergreens depends heavily on the desired landscape outcome. Due to its massive size and rapid growth, the green giant arborvitae functions best as a standalone specimen, a windbreak, or a boundary hedge where there is ample space. Pruning is usually minimal, limited to removing any dead or damaged branches. Conversely, smaller thuja varieties are ideal for foundation plantings, hedges, or topiary, requiring more frequent shearing to maintain a tidy shape but offering greater design flexibility in confined areas.
Planting and Long-Term Care
Successful cultivation begins with proper planting techniques that apply to both types. Choose a location with full sun exposure and sufficient space away from structures and underground utilities. Dig a hole that is as deep as the root ball and two to three times wider to encourage outward root growth. Mulching the base helps retain moisture and regulate soil temperature. Although green giant arborvitae is low-maintenance, an established thuja may require supplemental watering during prolonged dry spells to maintain its vibrant appearance.
