Boxwood hedges are a popular choice for gardens and landscapes, prized for their lush greenery and ability to create neat, structured borders. However, it can be alarming to see sections of your boxwood hedge turning brown. This discoloration can result from several factors, including pests, diseases, and environmental stress.

Here are 5 reasons your boxwood hedge is turning brown and tips to restore its health and vitality.

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1. Boxwood Blight

Boxwood blight is a fungal disease that causes severe damage to boxwood plants, often resulting in browning and defoliation.

Symptoms:

• Circular, brown leaf spots with darker edges.
• Black streaks on stems.
• Rapid leaf drop, leaving bare branches.

Solution:

• Remove and destroy infected branches to prevent the spread of the disease.
• Avoid overhead watering, as moisture on leaves promotes fungal growth.
• Apply fungicides approved for boxwood blight as a preventative measure.

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2. Pests: Boxwood Leafminer and Spider Mites

Pests like boxwood leafminer and spider mites can damage your hedge, leading to browning and overall decline.

Symptoms:

• Boxwood Leafminer: Leaves appear blistered or speckled with yellow, and larvae inside the leaves cause browning.
• Spider Mites: Tiny, webbing insects that cause stippling and discoloration on leaves.

Solution:

• Prune infested branches to remove pests.
• Use insecticidal soap or neem oil to control active infestations.
• Introduce natural predators like ladybugs to keep pest populations in check.

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3. Winter Damage

Victoria, BC’s mild winters can still cause boxwood hedges to suffer from winter damage, particularly during periods of freezing temperatures, wind, or sudden temperature changes.

Symptoms:

• Leaves turn brown or bronze, especially on the side exposed to wind and sun.
• Browning typically occurs in late winter or early spring.

Solution:

• Protect hedges with burlap screens during the winter to shield them from harsh winds and sun.
• Apply mulch around the base to insulate the roots and retain moisture.
• Water your hedge during dry winter periods to prevent dehydration.

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4. Root Rot

Poor drainage or overwatering can cause root rot, a condition where the roots become waterlogged and unable to absorb nutrients, leading to browning leaves.

Symptoms:

• Browning or yellowing leaves starting at the base of the plant.
• Foul odor or mushy roots when inspected.

Solution:

• Improve soil drainage by amending with organic matter or planting in raised beds.
• Water only when the soil is dry to the touch, avoiding overwatering.
• If root rot is severe, replace the plant with a new boxwood in better-draining soil.

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5. Nutrient Deficiencies or Environmental Stress

Boxwood hedges require balanced nutrients and a stable environment to thrive. Stress from poor soil, drought, or nutrient deficiencies can cause browning.

Symptoms:

• General browning or yellowing across the hedge.
• Stunted growth or thinning foliage.

Solution:

• Test your soil to ensure proper pH (boxwoods prefer a pH of 6.5–7) and nutrient levels.
• Fertilize with a balanced, slow-release fertilizer formulated for boxwoods.
• Water deeply during dry periods and apply mulch to retain moisture and regulate soil temperature.

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Conclusion

A boxwood hedge turning brown can be a sign of various issues, from disease and pests to environmental stress. Identifying the cause early and taking appropriate action is key to restoring your hedge's health and vibrancy.

For professional care and expert advice, Ascent Yard Care offers specialized services to diagnose and treat boxwood problems in Victoria, BC. Contact us today to keep your hedges green, healthy, and beautiful year-round!

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