How To Trim Large Arborvitae Trees

To trim large arborvitae trees, you need to approach the job with patience and a clear plan to avoid damaging their dense foliage.

And this Fiskars Tree Trimmer on Amazon can be a practical addition for you, so click the link to check it out.

If you’ve been wondering how to trim large arborvitae trees effectively, the key is to work slowly and never cut into the brown inner branches.

Many gardeners get nervous when trimming large arborvitae because they fear ruining the tree’s classic conical shape.

But with the right technique, you can keep your tall evergreens healthy, tidy, and beautiful for years to come.

In this post, we’ll cover the exact methods for trimming large arborvitae trees, when to prune, and common mistakes to skip.

Let’s walk through the process so you feel confident picking up those loppers.

How To Trim Large Arborvitae Trees Without Ruining Their Shape

When you trim large arborvitae trees, the first thing to understand is how these evergreens grow.
 
Arborvitae produce new growth only from the green tips of branches.
 
If you cut back into the brown, leafless interior while trimming large arborvitae trees, that part will never regrow.
 
Here are the key principles to follow when you trim large arborvitae trees:
 

1. Always Leave Some Green Foliage

When trimming large arborvitae trees, only remove the green outer layer.
 
Aim to cut no deeper than the outer 6 to 12 inches of growth.
 
This way, the tree will quickly fill back in with fresh greenery.
 
If you accidentally cut into the brown wood while trimming large arborvitae trees, those bare spots will stay bare forever.
 

2. Use The Correct Tools For The Job

Trimming large arborvitae trees requires sharp, clean tools to make smooth cuts.
 
Hand pruners work well for small branches up to half an inch thick.
 
For thicker growth, use bypass loppers or a pruning saw.
 
Hedge shears are fine for shaping the outer surface when trimming large arborvitae trees, but be careful not to tear the foliage.
 

And this Fiskars Tree Trimmer on Amazon can be a practical addition for you, so click the link to check it out.

3. Follow The Natural Taper

When you trim large arborvitae trees, maintain a wider base and a narrower top.
 
This shape allows sunlight to reach the lower branches and prevents them from dying back.
 
If you trim large arborvitae trees into a flat or inverted shape, the lower foliage will thin out over time.
 

The Best Time Of Year To Trim Large Arborvitae Trees

Timing matters a great deal when you plan to trim large arborvitae trees.
 
Pruning at the wrong season can stress the tree or encourage disease.
 
Here’s when you should and shouldn’t trim large arborvitae trees:
 

1. Late Winter Or Early Spring Is Ideal

The best time to trim large arborvitae trees is in late winter or very early spring before new growth begins.
 
The tree is still dormant, so it experiences less shock from pruning.
 
Plus, you can see the structure clearly without dense foliage in the way.
 
If you trim large arborvitae trees in spring, the fresh cuts will heal quickly as new growth emerges.
 

2. Avoid Heavy Pruning In Summer Heat

Trimming large arborvitae trees during hot, dry weather can cause sunburn on exposed branches.
 
The tree loses some of its protective foliage just when it needs shade most.
 
If you must trim large arborvitae trees in summer, only remove light tip growth and keep the interior covered.
 

3. Light Maintenance In Early Fall

You can do a light trim of large arborvitae trees in early fall to tidy up wayward shoots.
 
But don’t prune after mid-autumn because new growth won’t harden off before frost.
 
If you trim large arborvitae trees too late, winter damage can kill those tender tips.
 

Step-By-Step Guide To Trim Large Arborvitae Trees

Now let’s get into the actual process so you know exactly what to do when you trim large arborvitae trees.
 
Follow these steps in order for the best results:
 

1. Assess The Tree Before You Start

Before you trim large arborvitae trees, walk around and look for dead, broken, or diseased branches.
 
Mark any areas that need extra attention.
 
Also note the natural shape so you know where to make your cuts.
 
When you trim large arborvitae trees, always remove dead wood first to improve air circulation.
 

2. Remove Dead And Damaged Branches

Use hand pruners or a pruning saw to cut away any dead or dying limbs.
 
Make the cut just above the branch collar, not flush with the trunk.
 
This step is crucial when you trim large arborvitae trees because dead wood invites pests and rot.
 

3. Shape The Top And Sides Gradually

With hedge shears or pruners, start at the top and work your way down when you trim large arborvitae trees.
 
Cut the top back by no more than one-third of its height per year.
 
Then shape the sides, keeping the base slightly wider than the top.
 
Step back frequently as you trim large arborvitae trees to check the symmetry.
 

4. Clean Up And Water Well

After you trim large arborvitae trees, remove all clippings from around the base.
 
Debris can harbor fungi and block sunlight from lower branches.
 
Give the tree a deep watering to help it recover from the stress of pruning.
 
If the weather is dry, continue watering weekly for a month after you trim large arborvitae trees.
 

So, How Do You Trim Large Arborvitae Trees?

To trim large arborvitae trees, you need to work with their natural growth habit and avoid cutting into old brown wood.

And this Fiskars Tree Trimmer on Amazon can be a practical addition for you, so click the link to check it out.

The best approach involves using sharp tools, timing your pruning for late winter or early spring, and shaping the tree with a wider base.

Once you understand those basics, trimming large arborvitae trees becomes a straightforward yearly task.

Just remember to go slowly, leave green foliage intact, and step back often to check your progress.

With these tips, you can keep your tall arborvitae looking lush and well-shaped for many seasons to come.