Simply Trees

Thuja Green Giant

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Once a weekFull sunDeer resistant
  • Year-Round Dense Foliage: The Thuja Green Giant Arborvitae boasts a thick, vibrant green foliage throughout all seasons, making it a standout choice for consistent greenery in gardens and landscapes.
  • Natural Privacy Screen: Due to its tall and narrow growth habit, this Arborvitae variety serves as an excellent natural barrier, providing privacy and sound dampening, essential for secluded garden retreats or border linings.
  • Resilient Growth: Renowned for its robust nature, the Thuja Green Giant is both drought-resistant once established and can tolerate snow loads, ensuring it remains a garden staple in varied climate conditions.

More Details

The Thuja Green Giant, scientifically known as Thuja standishii x plicata 'Green Giant', is a robust and fast-growing evergreen, celebrated for its lush, dense foliage and towering presence. This hybrid arborvitae is a top choice for creating natural privacy screens, windbreaks, or as a stately standalone specimen in large landscapes. With its rich green color that persists through the winter and its resistance to common tree pests and diseases, the Thuja Green Giant is an ideal choice for gardeners and landscapers seeking a low-maintenance yet visually impressive evergreen tree.

Growth rate: Very fast growth rate, adding about 3 ft a year; mature height of 40-60 feet and width of 12-20 feet.

Please note: Images on our website depict plants and trees at full maturity to showcase their expected grown characteristics. These images are illustrative examples only and do not represent the size of plants or trees upon delivery.

Pruning: Minimal pruning needed; prune for shape or to remove damaged branches, preferably in early spring.

Fertilization: Apply a balanced, slow-release fertilizer in early spring to promote healthy growth.

Winter Protection: Generally winter hardy, but young plants may benefit from protection against severe frost in colder zones.

Choose a location with well-draining soil and adequate sunlight. Dig a hole twice as wide and as deep as the root ball. Place the tree in the hole, backfill with soil, and water thoroughly. Space trees appropriately if used for hedging. Regular watering is essential in the early stages to develop a strong root system.

The Thuja Green Giant requires consistent watering during its establishment phase, particularly important in its first few growing seasons. It thrives in full sun to partial shade, with full sun promoting the densest growth.

We process and ship your order as quickly as possible, typically within 1-3 business days. You will receive a shipping confirmation with tracking information once your item(s) ship.

We have perfected packaging and shipping plants & trees! That is why we DO NOT use any third-party fulfillment like most other online retailers. Your trees go straight from our farm to your door, safely packaged by our team of seasoned professionals. Our process ensures your plants leave our facility and arrive to your door in the best condition possible!

In cases of extreme cold or hot weather, we may temporarily delay shipping to ensure the well-being of your plants. Our primary focus is on delivering healthy and thriving plants to you. Rest assured, we'll make every effort to notify you of any delays promptly.

Please allow additional ship times during inclement weather and sale periods. We do not process or ship orders on the weekend or U.S. Holidays. Simply Trees is not responsible for delays due to carriers, local disruptions, or weather.

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Learn more about our Shipping Policy

At Simply Trees, we're committed to your satisfaction. If your plants arrive considerably damaged or sustained damage beyond the point of recovery, please contact us within five days at with clear photos for assistance. Our 30-day guarantee covers issues after planting, subject to our terms and conditions. We can't cover plants in the wrong climate or with inadequate care, but we're here to help in other situations. For a detailed understanding of our 30-day guarantee and how we ensure a fair process, click here to learn more.


Zones 5-9

The Thuja Green Giant is adaptable and hardy in USDA Zones 5-9, making it suitable for a variety of climatic conditions. It performs exceptionally well in both humid and dry regions, adapting to various soil types. This tree's tolerance for occasional drought and its ability to thrive in both full sun and partial shade make it a versatile choice for diverse landscaping needs, from residential properties to commercial areas.

Frequently Asked Questions

The Thuja Green Giant is a fast-growing evergreen tree that can reach heights of 30 to 40 feet or more at maturity. It is known for its rapid growth and dense, conical shape, making it a popular choice for creating privacy screens and windbreaks in landscaping.

Yes, Thuja Green Giants are known for their fast growth. These evergreen trees can grow at a rate of around 3 feet or more per year under optimal conditions, making them a popular choice for quickly establishing privacy hedges and windbreaks in landscapes.

When planting Thuja Green Giants for a privacy hedge or screen, it's recommended to space them approximately 5 to 6 feet apart. This spacing allows the trees to grow and fill in while creating a dense and effective barrier. Keep in mind that you can adjust the spacing slightly based on your specific landscape goals and preferences.

Thuja and Arborvitae are often used interchangeably in horticulture, but there are some distinctions:

Botanical Relationship: Thuja is a genus that includes several species, one of which is the Thuja Green Giant. Arborvitae is a common name used for several species of evergreen trees and shrubs, including those in the Thuja genus.

Size: While Thuja Green Giant is a specific cultivar known for its rapid growth and large size, not all Arborvitae species or cultivars grow as large. Some Arborvitae varieties are smaller and more compact.

Cultural Use: Both Thuja and Arborvitae are often planted for privacy screens and hedges due to their dense foliage. Thuja Green Giant, in particular, is popular for this purpose because of its fast growth.

In summary, Arborvitae is a common name that encompasses various evergreen species, including Thuja. Thuja Green Giant is a specific cultivar within the Thuja genus known for its fast growth and large size, making it a popular choice for privacy screens and windbreaks.

Thuja Green Giants do not typically have invasive roots. Their root systems are generally well-behaved and not known for causing issues like damaging foundations or invading water pipes. However, it's always a good practice to provide adequate space for these trees when planting to ensure they have room to grow without causing any potential problems.

When planting Thuja Green Giants near a property line, it's a good practice to plant them at least 5 to 6 feet away from the line. This spacing allows the trees to grow and develop without encroaching onto neighboring properties while still providing an effective privacy screen or windbreak. However, it's essential to check local regulations and property line requirements, as they can vary by location and may have specific guidelines for planting trees near property boundaries.

There are several possible reasons why a Thuja Green Giant may turn brown:

Drought Stress: Insufficient water can cause the foliage to turn brown. Thuja Green Giants require regular watering, especially during dry periods.

Winter Burn: Harsh winter conditions, particularly strong winds and cold temperatures, can lead to winter burn, causing the foliage to turn brown or bronze.

Disease or Pest Issues: Fungal diseases or pest infestations can affect the health of the tree and cause browning of the foliage.

Soil Issues: Poor soil quality or improper soil drainage can impact the tree's health and lead to browning.

Overcrowding: If planted too closely together, Thuja Green Giants may compete for nutrients and sunlight, resulting in browning foliage.

To address the issue, it's essential to identify the specific cause of browning and take appropriate action. This may include adjusting watering practices, addressing soil issues, applying treatments for pests or diseases, or providing protection from harsh winter conditions. If the problem persists, consulting with a local horticulturist or arborist can be beneficial in diagnosing and treating the tree.

Thuja Green Giants should be watered regularly, especially during the first year after planting to establish a strong root system. Here are some general guidelines for watering:

Initial Watering: Water thoroughly after planting to settle the soil around the roots. Ensure the root ball is evenly moist.

First Year: Water deeply and consistently, providing enough moisture to keep the soil evenly moist but not waterlogged. Typically, this means watering every 1-2 weeks, depending on local weather conditions.

Subsequent Years: Once established, Thuja Green Giants are moderately drought-tolerant. Water deeply during dry spells or when the soil is dry to a depth of about 2 inches. This may require watering every 2-4 weeks, depending on your climate.

Winter Watering: In colder climates, it's important to water the tree in late fall before the ground freezes. This helps prevent winter drying and winter burn.

Always check the soil moisture by inserting your finger into the soil near the tree's base. If it feels dry at a depth of 2 inches, it's time to water. Proper watering is crucial for the health and vitality of Thuja Green Giants, especially during their early growth stages.

The best fertilizer for Thuja Green Giants is a balanced, slow-release granular fertilizer with an N-P-K (Nitrogen-Phosphorus-Potassium) ratio of approximately 10-10-10 or 14-14-14. This balanced fertilizer provides essential nutrients for healthy growth without promoting excessive foliage growth.

Here are some key points to keep in mind when fertilizing Thuja Green Giants:

Timing: Fertilize in early spring or late winter before the growing season begins. Avoid fertilizing during the fall because it can stimulate new growth that may be susceptible to winter damage.

Application: Spread the granular fertilizer evenly on the soil surface around the base of the tree. Follow the manufacturer's instructions for the recommended application rate.

Watering: After applying fertilizer, water the area thoroughly to help the nutrients reach the roots.

Avoid Over-Fertilization: Do not over-fertilize, as excessive nutrients can harm the tree. Always follow the recommended dosage on the fertilizer packaging.

Organic Options: If you prefer organic fertilizers, there are organic formulations available with balanced N-P-K ratios that can be suitable for Thuja Green Giants.

Regular, moderate fertilization can help promote healthy growth and vibrant foliage in these trees.

Yes, you can prune the Thuja Green Giant. Pruning can help maintain the shape, size, and density of the tree. Here are some key points to consider when pruning Thuja Green Giants:

Timing: The best time to prune is during the late winter or early spring before new growth begins. This allows the tree to recover and produce new growth during the growing season.

Tools: Use sharp and clean pruning shears or hedge trimmers for pruning. Make clean cuts to minimize the risk of damaging the branches.

Pruning Goals: You can prune to shape the tree, remove dead or diseased branches, or reduce the size if it has become too large for its space. It's important to have a clear goal in mind before you start pruning.

Branch Removal: When removing branches, cut just above a lateral branch or bud to encourage new growth. Avoid cutting too close to the main trunk, as this can damage the tree.

Thinning: Thinning out some branches can improve air circulation and reduce the risk of disease. This is especially important in areas with high humidity.

Safety: When pruning, take safety precautions such as wearing gloves and eye protection. If the tree is large and requires extensive pruning, consider hiring a professional arborist.

Regular pruning can help keep your Thuja Green Giant healthy and looking its best.

Our Process

We have perfected packaging and shipping plants & trees! That is why we DO NOT use any third-party fulfillment like most other online retailers. Your trees go straight from our farm to your door, safely packaged by our team of seasoned professionals. Our process ensures your plants leave our facility and arrive to your door in the best condition possible!