Can brown arborvitae turn green again?

Table of Contents

The question of whether a brown arborvitae can return to its vibrant green hue is complex. While irreversibly dead foliage cannot regenerate, brown arborvitae experiencing stress may recover if the underlying issues are addressed.

Introduction: The Arborvitae Appeal and Browning Woes

Arborvitae, meaning “tree of life,” are popular evergreen conifers cherished for their dense foliage, elegant pyramidal shape, and versatility in landscaping. They provide privacy screens, windbreaks, and ornamental beauty. However, a common concern among arborvitae owners is the appearance of brown foliage. This browning, often alarming, raises the crucial question: Can brown arborvitae turn green again? Understanding the causes of browning and the potential for recovery is vital for maintaining healthy and thriving arborvitae.

Causes of Arborvitae Browning

Several factors can contribute to arborvitae turning brown, and identifying the root cause is the first step toward potential recovery.

Environmental Stress: Harsh weather conditions like drought, excessive heat, or severe cold can stress arborvitae, leading to browning, especially on the exposed outer foliage. Salt spray from roads in winter can also cause browning.
Disease: Fungal diseases, such as Phomopsis, Kabatina, or Seiridium canker, can attack arborvitae, causing branch dieback and browning.
Pests: Infestations by spider mites, bagworms, or other pests can damage the foliage and lead to browning.
Improper Watering: Both underwatering and overwatering can stress the tree. Underwatering causes desiccation, while overwatering can lead to root rot.
Nutrient Deficiencies: Lack of essential nutrients like magnesium or iron can result in chlorosis (yellowing) and eventual browning.
Physical Damage: Damage from animals, lawnmowers, or construction can wound the tree and contribute to browning.
Transplant Shock: Newly planted arborvitae may experience transplant shock, leading to temporary browning as they adjust to their new environment.

Determining the Extent of the Damage

Before attempting any treatment, carefully assess the extent of the browning. This involves:

Checking the Branches: Snap a few browned branches. If they are brittle and easily break, they are likely dead. If they are pliable and still have some green tissue inside, there is a chance of recovery.
Examining the Root System: If possible, check the soil around the base of the tree. It should not be waterlogged or have a foul odor, which could indicate root rot.
Looking for Pests or Diseases: Carefully inspect the foliage for signs of pests like spider mites (fine webbing) or disease lesions (discolored spots).

Steps to Help Brown Arborvitae Recover

If the browning is not too severe and the underlying cause is addressed, brown arborvitae can potentially turn green again. The following steps can increase the chances of recovery:

Identify and Address the Cause: Determine the specific reason for the browning (e.g., drought, disease, pests) and take appropriate action.
Proper Watering: Water deeply but infrequently, allowing the soil to dry slightly between waterings. Avoid overwatering, especially in poorly drained soils.
Fertilizing: If a nutrient deficiency is suspected, conduct a soil test and apply a balanced fertilizer appropriate for evergreens. Avoid over-fertilizing, as this can cause further stress.
Pruning: Prune out any dead or severely damaged branches to improve air circulation and prevent the spread of disease.
Pest and Disease Control: Treat any pest infestations or diseases promptly using appropriate insecticides or fungicides. Always follow the manufacturer’s instructions carefully.
Mulching: Apply a layer of organic mulch around the base of the tree to help retain moisture, suppress weeds, and regulate soil temperature.
Provide Protection: Protect the tree from harsh weather conditions, such as excessive sun or winter winds.

Understanding the Limitations

While arborvitae can sometimes recover from browning, it’s important to understand the limitations.

Irreversible Damage: Foliage that is completely brown and brittle is likely dead and will not turn green again.
Timeframe: Recovery can take time, often several months or even a year. Patience is key.
Severity of the Problem: Severely damaged or diseased trees may not be able to recover, even with the best care.

Preventative Measures for Healthy Arborvitae

Preventing browning in the first place is always preferable to trying to revive a struggling tree. Key preventative measures include:

Proper Planting: Plant arborvitae in well-drained soil in a location that receives adequate sunlight.
Regular Watering: Water deeply and regularly, especially during dry periods.
Mulching: Apply a layer of mulch around the base of the tree to retain moisture and suppress weeds.
Fertilizing: Fertilize annually in the spring with a balanced fertilizer formulated for evergreens.
Pest and Disease Monitoring: Regularly inspect your arborvitae for signs of pests or diseases and take action promptly if any problems are detected.

Comparing Common Arborvitae Varieties

Variety	Description	Susceptibility to Browning	Notes
——————-	—————————————————————————–	—————————–	——————————————————————–
Emerald Green	Dense, narrow columnar shape, bright green foliage	Moderate	Popular for privacy screens; susceptible to winter burn in windy areas
Green Giant	Fast-growing, large pyramidal shape, dark green foliage	Low	More resistant to diseases and pests; tolerates a wider range of soil conditions
Techny (Mission)	Dense, compact habit, dark green foliage	Moderate	Good cold hardiness; relatively slow-growing
Degroot’s Spire	Narrow, columnar shape with twisted, feathery foliage	Moderate	Unique texture; may be more susceptible to spider mites

Frequently Asked Questions

Will the brown parts of my arborvitae ever turn green again?

No, foliage that is completely brown and brittle is dead and will not turn green again. New growth will need to emerge to replace the damaged foliage. However, if the browning is only partial and the branch is still pliable, there is a chance of recovery.

What does it mean if only the inside of my arborvitae is brown?

This is often natural shedding of older, inner needles as the tree grows. However, it can also be a sign of stress if it’s excessive. Ensure the tree is getting enough water and is not exposed to other stressors.

How often should I water my arborvitae?

Water deeply when the top few inches of soil feel dry to the touch. The frequency will depend on the weather and soil conditions. Avoid overwatering, which can lead to root rot. Newly planted arborvitae need more frequent watering.

What kind of fertilizer should I use for my arborvitae?

Use a balanced fertilizer formulated for evergreens, such as a 10-10-10 or a 12-6-6. Apply it in the spring, following the manufacturer’s instructions carefully.

Is it safe to prune brown branches off my arborvitae?

Yes, pruning dead or severely damaged branches is beneficial. It improves air circulation and prevents the spread of disease. Always use clean, sharp pruning tools.

How can I protect my arborvitae from winter burn?

Wrap the tree with burlap or spray it with an anti-desiccant spray in the late fall to reduce moisture loss during the winter. Ensuring adequate watering before the ground freezes also helps.

What are some common pests that attack arborvitae?

Common pests include spider mites, bagworms, and scale insects. Regularly inspect your tree for signs of infestation and treat promptly with appropriate insecticides.

What are some common diseases that affect arborvitae?

Common diseases include Phomopsis, Kabatina, and Seiridium canker. These fungal diseases can cause branch dieback and browning. Proper watering and pruning can help prevent disease.

How can I tell if my arborvitae has root rot?

Signs of root rot include wilting, yellowing, and stunted growth. The soil around the base of the tree may be waterlogged and have a foul odor. Improving drainage and avoiding overwatering can help prevent root rot.

How long does it take for an arborvitae to recover from browning?

Recovery can take several months or even a year, depending on the severity of the problem and the overall health of the tree. Patience is key. Consistent care and attention will increase the chances of a full recovery.

Can Can brown arborvitae turn green again? if the browning is caused by dog urine?

Dog urine is high in nitrogen and can burn the foliage. Flush the area with plenty of water immediately after the urine is applied. Consider creating a barrier around the tree to prevent future damage. Severely burned areas will likely need to be pruned.

Is there anything else I can do to help my brown arborvitae?

Ensure the tree is receiving adequate sunlight and air circulation. Consider having a professional arborist assess the tree to identify any underlying problems and recommend appropriate treatment. While the question of Can brown arborvitae turn green again? may be difficult to answer definitively, proactive care greatly increases the chances of recovery.