How To Fix Brown Spots On Arborvitae

To fix brown spots on arborvitae, you need to address the underlying cause rather than just masking the symptoms.

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Brown spots on arborvitae can appear for several reasons, including environmental stress, pests, or fungal infections.

If you’ve noticed your arborvitae developing brown patches, the good news is most of these issues can be corrected.

In this post, we’ll explore how to fix brown spots on arborvitae step by step, so you can restore your shrubs to their lush, green glory.

Let’s jump right in.

How to Fix Brown Spots on Arborvitae by Identifying the Cause

The first step in how to fix brown spots on arborvitae is figuring out what’s causing them.
 
Without identifying the root problem, any treatment will only be temporary.
 
Here are the most common culprits and how to spot them.
 

1. Environmental Stress

Environmental stress is a leading reason for brown spots on arborvitae.
 
Drought, excessive heat, or sudden cold snaps can cause foliage to turn brown.
 
Winter burn is especially common when arborvitae lose moisture through their leaves faster than roots can absorb it from frozen soil.
 
If you see browning on the side facing wind or sun, environmental stress is likely your issue.
 

2. Pest Infestations

Pests like spider mites, bagworms, and aphids can also create brown spots on arborvitae.
 
Spider mites cause a stippled, bronze appearance that turns brown over time, while bagworms chew needles and leave bare patches.
 
Inspect your arborvitae closely for tiny webbing, small bags, or sticky residue, all signs of pest activity.
 

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3. Fungal Diseases

Fungal infections such as blight or tip blight often start as small brown spots on arborvitae and spread quickly.
 
Look for black or dark brown lesions on stems and needles, especially after wet, humid weather.
 
Poor air circulation around your arborvitae can increase the risk of fungal problems.
 

How to Fix Brown Spots on Arborvitae Through Environmental Care

Once you’ve identified the cause, you can start fixing brown spots on arborvitae by improving growing conditions.
 
Proper environmental care often prevents future browning and helps stressed plants recover.
 

1. Adjust Your Watering Routine

Water deeply and infrequently to encourage deep root growth, which helps fix brown spots on arborvitae caused by drought.
 
During dry spells, provide about one inch of water per week, including rainfall.
 
Avoid overhead watering late in the day because wet foliage overnight promotes fungal issues.
 
Mulch around the base to retain soil moisture and regulate temperature.
 

2. Protect Arborvitae From Winter Burn

To fix brown spots on arborvitae from winter burn, shield your shrubs with burlap or anti-desiccant sprays before the first hard freeze.
 
Plant arborvitae in locations sheltered from harsh winds and ensure they’re well-hydrated going into winter.
 
You can also water them deeply until the ground freezes, which helps roots store enough moisture.
 

3. Improve Soil Drainage and Fertility

Poor drainage can cause yellowing followed by brown spots on arborvitae, so make sure the soil isn’t waterlogged.
 
If you have heavy clay soil, amend it with organic matter to improve drainage and aeration.
 
Test your soil pH; arborvitae prefers slightly acidic to neutral soil (pH 6.0 to 7.0) for best health.
 

How to Fix Brown Spots on Arborvitae With Targeted Treatment

Sometimes environmental fixes aren’t enough, and you need direct treatment to fix brown spots on arborvitae.
 
This approach works best for pests and fungal diseases.
 

1. Prune Away Damaged Foliage

Pruning is a quick way to fix brown spots on arborvitae that are already dead or dying.
 
Use clean, sharp pruners to remove brown tips and branches, cutting back to healthy green growth.
 
This improves air circulation and removes disease spores, which stops the problem from spreading.
 

2. Apply Fungicide for Fungal Issues

When brown spots on arborvitae are caused by fungal disease, apply a copper-based fungicide according to label instructions.
 
Spray early in the season before symptoms appear, or at the first sign of trouble, to fix brown spots on arborvitae effectively.
 
Repeat applications every 7 to 14 days during wet weather for ongoing protection.
 

3. Use Insecticidal Soap or Neem Oil for Pests

Insecticidal soap or neem oil works well to fix brown spots on arborvitae caused by spider mites, aphids, or other soft-bodied pests.
 
Spray thoroughly, including the undersides of foliage, and repeat as needed every few days until the infestation clears.
 
For bagworms, handpick the bags and destroy them before the larvae emerge.
 

So, How to Fix Brown Spots on Arborvitae?

To fix brown spots on arborvitae, you must first identify the cause, then take targeted action.

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

Whether it’s environmental stress, pests, or disease, each issue has a specific solution that can restore your arborvitae’s health and beauty.

Start with proper watering, mulching, and winter protection, then move to pruning or treatments if needed.

With patience and consistent care, you can fix brown spots on arborvitae and keep your shrubs thriving for years to come.