What Causes Boxwood Leaves To Turn Orange

Boxwood leaves turn orange due to a combination of environmental stress, seasonal changes, and sometimes disease.
 
If you’ve noticed your boxwood leaves turning orange, you’re not alone and it’s actually a pretty common concern for gardeners.
 
The orange discoloration can be alarming but in many cases, it’s a natural response that doesn’t mean your plant is dying.
 
Understanding what causes boxwood leaves to turn orange is the first step to helping your shrubs recover and thrive.
 
In this post, we’ll break down the main reasons behind orange boxwood leaves and what you can do about each cause.
 
Let’s dig into the reasons those boxwood leaves turn orange.
 

What Causes Boxwood Leaves To Turn Orange

The main causes of boxwood leaves turning orange include winter injury, nutrient deficiencies, and root problems.
 
Each of these factors stresses the plant in a different way, and the orange color is your boxwood’s way of signaling trouble.
 
Let’s look at each cause in detail so you can identify what’s affecting your boxwood leaves to turn orange.
 

1. Winter Injury and Cold Stress

Winter injury is one of the most common reasons boxwood leaves turn orange.
 
When temperatures drop suddenly or harsh winds hit the foliage, the leaves lose moisture faster than the roots can replace it.
 
This dehydration causes the leaves to develop an orange or bronze tint, especially on the side facing the wind or sun.
 
The orange color from winter injury usually shows up in late winter or early spring as the plant wakes up.
 
Boxwood leaves turning orange from cold stress often look scorched or dried out along the edges.
 
The good news is that this type of boxwood leaves turning orange is usually not fatal.
 
Once new growth emerges in spring, the orange leaves often drop off and are replaced by healthy green foliage.
 

2. Nutrient Deficiencies in the Soil

Another reason boxwood leaves turn orange is a lack of essential nutrients, particularly nitrogen or iron.
 
When boxwood doesn’t get enough nitrogen, the older leaves may turn yellow or orange before falling off.
 
Iron deficiency, on the other hand, causes the younger leaves to develop an orange or pale color between the veins.
 
If your boxwood leaves turn orange and the soil is poor or compacted, a nutrient imbalance could be the culprit.
 
Soil pH that’s too high or too low can also block nutrient uptake and cause boxwood leaves to turn orange.
 
A simple soil test will tell you exactly what’s missing so you can correct the deficiency.
 
Feeding your boxwood with a balanced fertilizer in early spring can help prevent boxwood leaves turning orange from nutrient issues.
 

3. Root Rot and Poor Drainage

Root rot from overly wet soil is another reason boxwood leaves turn orange.
 
Boxwood needs well-drained soil, and when the roots sit in water, they start to decay.
 
As the roots die, the plant can’t take up water or nutrients, and the leaves respond by turning orange or brown.
 
Boxwood leaves turning orange from root rot often look wilted or droopy first, then the color change follows.
 
If you dig around the base, the roots may appear dark, mushy, or have a foul smell.
 
Improving drainage by amending the soil with compost or planting in raised beds can stop boxwood leaves from turning orange due to rot.
 
In severe cases, you may need to remove affected plants to prevent the disease from spreading to healthy boxwood.
 

Other Factors That Cause Boxwood Leaves To Turn Orange

Beyond the main causes, a few other issues can make boxwood leaves turn orange.
 
These are less common but worth checking if the primary causes don’t match your situation.
 

1. Pest Infestations

Boxwood leafminer and boxwood mites are two pests that can cause boxwood leaves to turn orange.
 
Leafminer larvae tunnel inside the leaves, creating blisters that turn orange or brown over time.
 
Mites feed on the undersides of leaves, causing a stippled appearance that can look orange from a distance.
 
If you see tiny insects or webbing on your boxwood leaves turning orange, pests might be the cause.
 
Treating with horticultural oil or insecticidal soap in early spring can help control these pests.
 

2. Sunscald and Environmental Stress

Too much direct sunlight, especially in winter, can cause boxwood leaves to turn orange.
 
This is called sunscald, and it happens when the sun heats the leaves on cold days, causing tissue damage.
 
Boxwood leaves turning orange from sunscald usually appear on the south or west side of the plant.
 
Drought stress can also cause boxwood leaves to turn orange, as the plant conserves water by shedding older foliage.
 
Providing afternoon shade and mulching around the base can reduce this type of stress.
 

So, What Causes Boxwood Leaves To Turn Orange?

Boxwood leaves turn orange due to winter injury, nutrient deficiencies, root rot, pests, or environmental stress.
 
The exact cause depends on your specific growing conditions and the time of year you notice the orange color.
 
Winter injury is the most common reason boxwood leaves turn orange, especially in colder climates.
 
Nutrient deficiencies and root rot are also frequent causes when the soil or drainage is less than ideal.
 
By identifying which factor is affecting your boxwood leaves to turn orange, you can take the right steps to fix it.
 
Most cases of boxwood leaves turning orange are reversible with proper care and a little patience.
 
If the orange leaves are widespread and the plant looks unhealthy, consider consulting a local extension service for a precise diagnosis.
 
With the right attention, your boxwood can bounce back and stay green for years to come.