Can You Top Off Green Giant Arborvitae

You should not top off Green Giant arborvitae as a routine pruning practice.
 
Topping off Green Giant arborvitae might seem like a quick fix for size control, but it harms the tree’s natural shape and long-term health.
 
If you’re wondering whether you can top off Green Giant arborvitae to keep it shorter, the answer is no — because this method does more damage than good.
 
In this post, we’ll explain why topping off Green Giant arborvitae is discouraged, what actually happens when you top these evergreens, and what to do instead.
 

Why You Should Avoid Topping Off Green Giant Arborvitae

The main reason you should not top off Green Giant arborvitae is that it ruins the tree’s natural pyramidal form.
 
When you cut off the top, you remove the dominant central leader, which is the main upright stem that gives the tree its classic shape.
 
Without that leader, the tree struggles to grow upward properly, and you’ll end up with a stubby, unnatural-looking plant.
 

Topping Stunts Vertical Growth Permanently

Green Giant arborvitae are bred to grow tall and fast — up to three feet per year when young.
 
When you top off green giants, you remove the growth tips that produce new upward growth, and the tree loses its momentum.
 
The remaining side branches may try to take over, but they’ll never form a strong, upright leader again.
 
So if you were hoping topping would simply slow the tree’s height, you’ll actually stress it and stunt its natural development.
 

Topping Creates Weak Branch Angles

When you top off Green Giant arborvitae, the tree responds by pushing out multiple shoots from the cut area.
 
These new shoots are weakly attached and often grow at narrow angles, making them prone to breakage in wind or snow.
 
A topped tree becomes structurally unsound because the new growth has no strong connection to the trunk.
 
Over time, you may see branches splitting or the entire top collapsing under its own weight.
 

Topping Invites Disease and Pests

The large wound left after you top off Green Giant arborvitae is an open door for pathogens.
 
Fungal diseases like Seiridium canker and tip blight often infect trees that have been topped, especially in humid climates.
 
Bark beetles and other boring insects are also attracted to stressed arborvitae, and a topped tree is a stressed tree.
 
So even if you think you’re saving space, you’re actually increasing the risk of losing the whole plant to disease.
 

What Happens When You Top Off Green Giant Arborvitae?

Let’s look at the real-world results of topping off green giant arborvitae so you know exactly what to expect.
 

Unattractive Bushy Regrowth

After you top off the central leader, the tree produces a cluster of small, upright shoots just below the cut.
 
These shoots grow in a dense, bushy clump that looks unnatural and often resembles a witch’s broom.
 
The overall silhouette becomes lumpy and irregular, ruining the sleek, columnar look that green giants are loved for.
 
If you value curb appeal, topping off Green Giant arborvitae will give you the opposite.
 

Dieback of the Topped Leader

Sometimes, after you top off the tree, the exposed cut end dries out and dies back several inches.
 
This dieback can extend into the trunk, causing a permanent dead stub that rots over time.
 
Dead wood then attracts woodpeckers and decay fungi, which can spread to healthy parts of the tree.
 
Topping off green giant arborvitae often leads to this cycle of dieback and decay, shortening the tree’s lifespan.
 

Loss of Natural Wind Resistance

Green giant arborvitae naturally taper from a broad base to a narrow top, which helps them shed wind.
 
When you top off the tree, you remove that taper and create a blunt, flat crown that catches wind like a sail.
 
Uprooting or trunk snapping becomes much more likely after a strong storm.
 
So if you live in a windy area, topping off Green Giant arborvitae actually makes the tree less stable, not more manageable.
 

Better Alternatives to Topping Off Green Giant Arborvitae

Instead of asking “can you top off green giant arborvitae,” ask what smart pruning techniques can help you manage size without harming health.
 

Selective Pruning of Side Branches

To control the overall size, prune back the side branches rather than cutting the top.
 
Use hand pruners to cut individual branches back to a lateral bud or a main trunk.
 
This preserves the central leader and keeps the natural pyramidal shape intact.
 
You can reduce the tree’s width significantly by removing a few long side branches each year — and you never need to top off the green giant arborvitae.
 

Thinning the Interior for Airflow

Another good practice is thinning out crowded inner branches.
 
This allows light and air to reach the center of the tree, reducing the risk of fungal issues.
 
When you thin, you remove whole branches at their point of origin, not just tips.
 
Thinning is far healthier than topping off Green Giant arborvitae because it doesn’t create large wounds or destroy the leader.
 

Plant the Right Cultivar from the Start

If height is a major concern, consider planting a smaller arborvitae variety instead of trying to top off green giants later.
 
‘Emerald Green’ or ‘Little Giant’ stay compact and require far less pruning.
 
Green Giant arborvitae can reach 50–60 feet tall, so expecting to keep them small by topping is a losing battle.
 
Choose a tree that naturally fits your space, and you’ll never have to ask “can you top off green giant arborvitae?” again.
 

So, Can You Top Off Green Giant Arborvitae?

You should not top off Green Giant arborvitae, no matter how tempting it seems for size control.
 
Topping off green giant arborvitae destroys the tree’s natural form, creates weak growth, and invites disease and pests.
 
Instead, use selective pruning, thinning, or pick a smaller variety from the beginning.
 
Green giants are beautiful, low-maintenance evergreens when left to grow naturally — so let them be.
 
If you need height management, apply the alternatives we covered, and skip the shears when it comes to the top.