How Do You Trim An Overgrown Arborvitae

You trim an overgrown arborvitae by making careful, strategic cuts that respect the plant’s natural growth habits.
 
If you’ve been wondering how to trim an overgrown arborvitae without ruining its shape or health, the answer lies in timing, technique, and knowing where to cut.
 
Trimming an overgrown arborvitae isn’t the same as pruning a regular shrub because arborvitaes have a unique growth pattern.
 
When you trim an overgrown arborvitae, you’re working with a plant that doesn’t push new growth from old, woody stems.
 
In this post, I’ll walk you through exactly how to trim an overgrown arborvitae, the best tools to use, and common mistakes to avoid.
 
Let’s dig in.
 

Why You Need to Trim an Overgrown Arborvitae

Trimming an overgrown arborvitae helps keep the plant healthy, dense, and attractive.
 
Here’s why you should trim an overgrown arborvitae:
 

1. Prevents Disease and Pest Problems

An overgrown arborvitae traps moisture deep inside its foliage, which invites fungal diseases and pests.
 
When you trim an overgrown arborvitae, you open up the canopy for better airflow and sunlight penetration.
 
This simple step reduces the risk of rot and keeps your arborvitae thriving.
 

2. Maintains a Desirable Shape

Arborvitaes naturally grow tall and wide, but an overgrown one can become lopsided or top-heavy.
 
Trimming an overgrown arborvitae restores that classic, tidy cone shape you planted it for.
 
Regular trims keep the plant looking uniform and prevent it from crowding pathways or windows.
 

3. Encourages New Growth

When you trim an overgrown arborvitae correctly, you stimulate fresh green shoots from the outer branches.
 
The plant responds to pruning by filling in bare spots and becoming fuller.
 
Trimming an overgrown arborvitae at the right time ensures this new growth stays vigorous.
 

When to Trim an Overgrown Arborvitae

Timing matters a lot when you trim an overgrown arborvitae.
 
Here’s the best window:
 

1. Late Winter or Early Spring

The ideal time to trim an overgrown arborvitae is just before the plant breaks dormancy.
 
Cutting in late winter or early spring minimizes stress and allows fresh growth to emerge during the growing season.
 
Avoid trimming an overgrown arborvitae in late fall because new cuts won’t heal before frost.
 

2. Light Summer Touch-ups

If your arborvitae got a little wild midsummer, you can lightly trim an overgrown arborvitae then too.
 
But keep it minimal — don’t remove more than one-third of the foliage at once.
 
Trimming an overgrown arborvitae heavily in summer can shock the plant and scorch exposed inner branches.
 

3. Avoid Dormant Season Hard Pruning

Some people think winter is the right time to trim an overgrown arborvitae, but that’s risky.
 
Cold weather slows healing, so cuts can dry out or invite infection.
 
Stick to late winter or early spring for the best results when you trim an overgrown arborvitae.
 

How to Trim an Overgrown Arborvitae Step by Step

Now let’s get into the actual process of trimming an overgrown arborvitae.
 

1. Gather the Right Tools

You’ll need clean, sharp bypass pruners for small branches and loppers for thicker stems.
 
For height, use a pole pruner or a step stool — never climb on the plant itself.
 
Disinfect tools with rubbing alcohol before you trim an overgrown arborvitae to prevent spreading disease.
 

2. Start by Removing Dead or Damaged Wood

Begin your trimming an overgrown arborvitae process by cutting out any brown, broken, or diseased branches.
 
Follow the branch back to a healthy fork or to the main trunk, then make a clean cut.
 
This step alone makes the plant look cleaner and opens up space for light.
 

3. Cut Back to Green Foliage — Never Bare Wood

The most important rule when you trim an overgrown arborvitae: never cut into the brown, leafless center.
 
Arborvitaes don’t regrow from old wood — only from green, needle-bearing stems.
 
If you trim back to a brown branch, that spot will remain bald forever.
 

4. Shape From the Bottom Up

When trimming an overgrown arborvitae, always work from the base upward.
 
Taper the plant so the bottom is slightly wider than the top, allowing sunlight to reach lower needles.
 
Make small, gradual cuts rather than hacking off large sections at once.
 

5. Don’t Remove More Than One-Third of the Foliage

If your arborvitae is massively overgrown, you may need to spread the trimming over two or three years.
 
When you trim an overgrown arborvitae too heavily in one season, you stress the plant and invite dieback.
 
Patience is key — take off just one-third of the growth each year.
 

So, How Do You Trim an Overgrown Arborvitae?

You trim an overgrown arborvitae by cutting back only to green foliage, shaping from the bottom up, and doing the work in late winter or early spring.
 
Always use clean tools, remove dead wood first, and never hack into bare brown branches.
 
When you trim an overgrown arborvitae with care, you get a healthier, denser, and more beautiful plant that fits your landscape perfectly.
 
Now you know exactly how to trim an overgrown arborvitae — grab your pruners and get started.