How Big Does A Green Giant Arborvitae Get

A Green Giant Arborvitae gets impressively large, reaching heights of 50 to 60 feet and spreading 12 to 18 feet wide at maturity.

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If you’re wondering how big does a green giant arborvitae get, you’re looking at one of the fastest-growing privacy trees available.

This hybrid Thuja can add 3 to 5 feet of new growth each year under the right conditions.

With that vigorous growth habit, the Green Giant Arborvitae quickly transforms into a living wall for your property.

In this post, we’ll explore exactly how big does a green giant arborvitae get, what influences its ultimate size, and how you can help it thrive.

Let’s dig into the details of the Green Giant Arborvitae’s size.

How Big Does A Green Giant Arborvitae Get in Height and Width

The straight answer to how big does a green giant arborvitae get involves both vertical and horizontal dimensions.
 
Understanding these numbers helps you plan your landscape space properly.
 

1. Mature Height Reaches 50 to 60 Feet

The Green Giant Arborvitae height typically stabilizes between 50 and 60 feet after 20 to 30 years.
 
Some exceptional specimens have been known to hit 70 feet in ideal climates.
 
That’s about as tall as a five-story building, so you need plenty of vertical space when asking how big does a green giant arborvitae get.
 
Annual growth spurts of 3 to 5 feet mean you’ll see noticeable height increases every season.
 

2. Mature Spread of 12 to 18 Feet

The Green Giant Arborvitae spread is equally important when considering how big does a green giant arborvitae get.
 
At full width, these trees span 12 to 18 feet, creating a dense, pyramidal shape.
 
Neighbors often plant them 5 to 6 feet apart for a solid screen, knowing the Green Giant Arborvitae will fill the gaps.
 
If you give them more space (10 to 12 feet apart), they develop a wider, more natural form.
 

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3. Growth Rate Directly Impacts Final Size

How big does a green giant arborvitae get depends heavily on its fast growth rate.
 
In its first few years after planting, expect 2 to 3 feet of new growth annually.
 
Once established, that rate jumps to 3 to 5 feet per year until the tree nears maturity.
 
That speed makes the Green Giant Arborvitae one of the quickest ways to achieve tall privacy screens.
 

Factors That Influence How Big a Green Giant Arborvitae Gets

Environment and care play major roles in how big does a green giant arborvitae get in your specific yard.
 
Even with its genetic potential, the tree’s actual size can vary.
 

1. Sunlight Requirements

The Green Giant Arborvitae thrives in full sun (at least 6 hours daily).
 
With less light, the tree grows slower and may not reach its maximum height or width.
 
Partial shade reduces the answer to how big does a green giant arborvitae get by 20 to 30 percent.
 
For the tallest, fullest tree, plant it where it gets unfiltered sunlight.
 

2. Soil and Watering

Well-draining soil with consistent moisture helps the Green Giant Arborvitae reach its full potential.
 
Soggy roots stunt growth and can cause dieback, limiting how big does a green giant arborvitae get.
 
During dry spells, deep watering twice a week maintains the rapid growth pace.
 
Mulching around the base conserves moisture and moderates soil temperature.
 

3. Spacing and Competition

When planted too close to other trees or structures, the Green Giant Arborvitae may not achieve its natural spread.
 
Root competition from large neighbors also reduces nutrient availability.
 
If you want the maximum answer to how big does a green giant arborvitae get, give it at least 10 feet of clearance on all sides.
 
Crowding forces the tree to grow taller but narrower, altering its typical shape.
 

Typical Timeline: How Big Does a Green Giant Arborvitae Get Over the Years

Seeing the growth progression helps you visualize the final landscape.
 
Here’s a year-by-year look at the Green Giant Arborvitae size.
 

Year 1–3: Establishment Phase

In the first three years, the tree focuses on root development.
 
You’ll see about 1 to 2 feet of top growth annually during this period.
 
At the end of year three, the Green Giant Arborvitae typically stands 5 to 8 feet tall.
 
Width stays compact at 3 to 4 feet during establishment.
 

Year 4–10: Rapid Growth Phase

This is when your answer to how big does a green giant arborvitae get starts to impress.
 
From years 4 to 10, the tree adds 3 to 5 feet each season.
 
By year 10, you’ll have a Green Giant Arborvitae 20 to 30 feet tall and 8 to 10 feet wide.
 
That’s a substantial privacy screen in less than a decade.
 

Year 10–20: Approaching Maturity

Growth slows slightly but remains steady at 2 to 3 feet per year.
 
By year 20, the tree reaches 40 to 50 feet in height and 12 to 15 feet in width.
 
You’re now close to the full answer to how big does a green giant arborvitae get.
 

Year 20+: Full Mature Size

After 20 years, the Green Giant Arborvitae reaches its final dimensions.
 
Expect 50 to 60 feet tall and 12 to 18 feet wide.
 
The growth rate drops to less than 1 foot per year beyond this point.
 
That’s the ultimate final answer to how big does a green giant arborvitae get in a home landscape.
 

So, How Big Does A Green Giant Arborvitae Get?

A Green Giant Arborvitae gets impressively large, reaching heights of 50 to 60 feet and spreading 12 to 18 feet wide at maturity.

And this Miracle-Gro All Purpose Fertilizer on Amazon can be a practical addition for you, so click the link to check it out.

If you’ve been wondering how big does a green giant arborvitae get, it’s one of the tallest and fastest evergreens for privacy.

Proper sun, soil, spacing, and water help the Green Giant Arborvitae achieve its full size.

Plan accordingly so this vigorous tree has room to grow into its magnificent final dimensions.

Hope this post has answered your question about how big does a green giant arborvitae get and what it takes to reach that size.