Green Giant arborvitae grows three feet per year until reaching fifty feet tall. If you are wondering exactly how tall does green giant arborvitae grow, the answer depends on age, soil, and care. This fast-growing evergreen is a top choice for privacy screens and windbreaks.
Many homeowners plant it expecting a quick hedge. They are rarely disappointed. The growth rate is impressive, but the final height can vary.
Let’s break down the numbers. You will learn the maximum height, spread, and what influences growth. We will also cover spacing, pruning, and common mistakes.
How Tall Does Green Giant Arborvitae Grow
In ideal conditions, Green Giant arborvitae reaches 50 to 60 feet tall. Some specimens have been recorded at 70 feet. The typical spread is 12 to 18 feet wide.
This makes it one of the tallest arborvitae varieties. It outgrows Emerald Green and Techny arborvitae by a wide margin. If you need a tall screen, this is your plant.
Growth Rate Per Year
Young trees grow fastest. In the first five years, expect 3 to 4 feet of new growth annually. After that, the rate slows to 1 to 2 feet per year.
- Years 1-5: 3-4 feet per year
- Years 5-10: 2-3 feet per year
- Years 10+: 1-2 feet per year
This means a 2-foot sapling can become a 20-foot tree in just six years. That is fast for an evergreen.
Maximum Height In Different Zones
Green Giant arborvitae grows best in USDA zones 5 through 8. In zone 5, winter cold can slow growth. Expect 40 to 50 feet max.
In zones 6 and 7, the tree thrives. It often reaches 55 to 60 feet. In zone 8, heat and humidity can reduce vigor. Height may top out at 45 feet.
Factors That Affect Final Height
Not every Green Giant reaches 50 feet. Several factors determine how tall your tree will get.
Soil Quality
Rich, loamy soil with good drainage is best. Sandy or clay soils slow growth. If your soil is poor, amend it with compost before planting.
Soil pH should be between 6.0 and 8.0. Acidic or alkaline extremes stunt growth. Test your soil and adjust if needed.
Sunlight
Full sun is ideal. Six to eight hours of direct sunlight daily produces the fastest growth. Partial shade reduces height by 20 to 30 percent.
In deep shade, the tree becomes leggy and thin. It may only reach 20 feet. Always plant in the sunniest spot available.
Watering
Consistent moisture is critical. Green Giants need 1 to 2 inches of water per week during the growing season. Drought stress stunts growth and can kill young trees.
Mulch around the base to retain moisture. Keep mulch 3 inches away from the trunk to prevent rot.
Spacing
If planted too close together, trees compete for resources. This limits height. For a hedge, space them 5 to 6 feet apart.
For specimen trees, give them 10 to 12 feet of space. Crowded trees rarely exceed 40 feet.
How To Measure Your Tree’s Height
You can estimate height without climbing. Use a simple method.
- Stand 50 feet from the tree.
- Hold a ruler at arm’s length.
- Measure the tree’s height on the ruler in inches.
- Multiply that number by 10.
For example, if the tree measures 5 inches on the ruler, it is about 50 feet tall. This works because of similar triangles.
For precise measurement, use a clinometer or laser rangefinder. These tools are cheap and accurate.
Common Misconceptions About Height
Some people think Green Giant arborvitae stays small. It does not. Others believe it grows forever. It does not.
The tree has a genetic limit. It will not keep growing past 70 feet. Most stop at 50 to 60 feet.
Another myth is that pruning controls height. Topping the tree ruins its shape. It also encourages weak, bushy growth at the top.
If you need a shorter tree, choose a different variety. Emerald Green arborvitae only reaches 15 feet. That might be a better fit.
Pruning For Height Control
You can prune Green Giant arborvitae to manage height. But do it correctly.
- Prune in late winter or early spring.
- Cut back the central leader by 1 to 2 feet.
- Remove no more than one-third of the foliage.
- Never cut into old wood without green growth.
Pruning reduces height temporarily. The tree will regrow, but slower. Repeat every few years to maintain a desired size.
For a natural look, let the tree grow freely. Only remove dead or damaged branches.
Comparison With Other Arborvitae Varieties
How does Green Giant compare to other popular types?
| Variety | Max Height | Growth Rate |
|---|---|---|
| Green Giant | 50-60 ft | 3-4 ft/year |
| Emerald Green | 12-15 ft | 1-2 ft/year |
| Techny | 15-20 ft | 2-3 ft/year |
| Nigra | 20-30 ft | 1-2 ft/year |
Green Giant is the tallest and fastest. It is the best choice for a tall screen. But it needs more space than smaller varieties.
Landscaping Uses Based On Height
Because of its size, Green Giant works best in specific situations.
Privacy Screens
Plant a row of Green Giants to block views. They create a dense, year-round barrier. Space them 5 to 6 feet apart for a solid screen.
Within 5 years, you will have a 15-foot wall. That is fast enough to hide a two-story house.
Windbreaks
On large properties, Green Giants make excellent windbreaks. They reduce wind speed and protect other plants.
Plant two or three rows in a staggered pattern. This creates a thick barrier that stops wind effectively.
Specimen Trees
A single Green Giant can be a focal point. Its tall, pyramidal shape stands out in a lawn. Give it plenty of room to spread.
Do not plant it near foundations or power lines. The roots are not invasive, but the canopy is large.
Potential Problems That Limit Height
Several issues can prevent your tree from reaching full height.
Pests
Bagworms are the most common pest. They defoliate branches and slow growth. Treat with Bacillus thuringiensis (Bt) in early summer.
Spider mites can also cause damage. They thrive in dry conditions. Hose off the foliage regularly to prevent infestations.
Diseases
Root rot is a major concern in wet soil. It kills roots and stunts growth. Ensure good drainage and avoid overwatering.
Needle blight causes browning and dieback. Prune affected branches and apply fungicide if needed.
Winter Damage
In cold climates, winter burn can kill foliage. This reduces height over time. Wrap young trees in burlap for protection.
Snow load can also break branches. Brush off heavy snow gently to avoid damage.
When To Expect Full Height
Under ideal conditions, Green Giant reaches 50 feet in 15 to 20 years. That is fast for a tree of this size.
In poor soil or partial shade, it may take 25 to 30 years. Some trees never reach 40 feet if conditions are bad.
Patience is key. The tree grows steadily but not overnight. With proper care, you will see impressive results.
Tips For Maximizing Height
If you want the tallest possible tree, follow these steps.
- Plant in full sun.
- Amend soil with compost.
- Water deeply once a week.
- Fertilize in spring with a balanced fertilizer.
- Mulch to retain moisture.
- Control pests and diseases promptly.
- Prune only to remove dead wood.
These practices ensure strong, healthy growth. Your tree will reach its genetic potential.
Common Questions About Green Giant Height
Here are answers to frequent queries.
Can Green Giant Arborvitae Grow In Containers?
It is not recommended. The tree grows too large. In a container, it will be stunted and may die. Plant it in the ground.
How Close To A House Can I Plant Green Giant?
Keep it at least 10 feet from the foundation. The canopy spreads wide. Branches should not touch the house.
Does Green Giant Arborvitae Have Invasive Roots?
No. The root system is fibrous and shallow. It does not damage foundations or pipes. But it can lift mulch and grass.
What Is The Lifespan Of Green Giant Arborvitae?
With good care, it lives 40 to 60 years. Some specimens exceed 80 years. It is a long-lived tree.
Can I Keep Green Giant At 10 Feet Tall?
Not easily. Constant pruning is required. The tree naturally wants to grow tall. Consider a dwarf variety instead.
Final Thoughts On Height
Green Giant arborvitae is a remarkable tree. It grows fast and tall. Knowing how tall does green giant arborvitae grow helps you plan your landscape.
Give it space, sun, and water. It will reward you with a majestic screen. Just be prepared for its size.
If you have a small yard, think twice. This tree needs room to spread. But if you have the space, it is hard to beat.
Plant it once and enjoy decades of privacy and beauty. The height is worth the wait.
Frequently Asked Questions
How Tall Does A Green Giant Arborvitae Get In 10 Years?
In 10 years, it typically reaches 20 to 25 feet. With optimal care, it can hit 30 feet. Growth slows after that.
What Is The Maximum Height Of Green Giant Arborvitae?
The maximum height is 50 to 60 feet. Rarely, it reaches 70 feet in perfect conditions. Most trees stop at 50 feet.
Does Green Giant Arborvitae Grow Taller Than Emerald Green?
Yes, much taller. Emerald Green maxes out at 15 feet. Green Giant is three to four times taller.
How Wide Does Green Giant Arborvitae Get?
The spread is 12 to 18 feet at the base. The top is narrower. Give it room to branch out.
Can I Plant Green Giant Arborvitae Under Power Lines?
No. The tree will grow into the lines. Plant it at least 30 feet away from overhead wires.