Buxus sempervirens Brown Leaf Tips - Causes & Fixes

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Drought Stress

Boxwoods have shallow root systems and are highly sensitive to water deficits. When soil moisture levels drop too low, the plant cannot transport enough water to the extremities, causing the leaf tips to desiccate and turn brown.

Very Common

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How to confirm: Check the soil moisture 2 inches below the surface; if it is bone dry, the plant needs immediate deep watering.

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1 Immediately deep-water the plant to ensure moisture reaches the entire shallow root system, making sure the soil is thoroughly saturated.

2 Use a soil moisture meter to monitor the root zone and prevent future drought cycles by watering before the soil becomes completely dry.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a layer of organic mulch around the base of the boxwood to help retain soil moisture and regulate temperature.

Yilotuce 11oz Sphagnum Moss

18.7 L • Sphagnum Moss

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Boxwood Blight (Cylindrocladium buxicola)

This fungal pathogen causes leaf spotting that can eventually lead to widespread necrosis and browning of foliage. While it often starts as dark spots, severe infections result in rapid tissue death at the tips and edges.

Common

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How to confirm: Inspect the leaves for small, dark, circular lesions or purplish-brown spots near the brown tips.

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1 Prune away all infected and brown foliage immediately using sterilized shears to prevent the spread of fungal spores to healthy parts of the plant.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

2 Apply an organic fungicide to the affected area to control the spread of the pathogen and protect new growth.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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3 Improve air circulation around the plant and avoid overhead watering, which can spread fungal spores through splashing.

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Salt Accumulation/Burn

Excessive salts from fertilizers or de-icing agents can accumulate in the substrate. This creates osmotic stress, drawing moisture out of the leaf cells and resulting in characteristic tip burn.

Common

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How to confirm: Check if there is a white, crusty residue on the soil surface or if the plant was recently fertilized heavily.

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1 Flush the soil thoroughly with large amounts of fresh, low-salt water to leach accumulated minerals and salts away from the root zone.

2 Check the soil moisture levels regularly using a moisture meter to ensure the plant is not experiencing drought stress alongside salt burn.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Prune away the most severely browned leaf tips using clean, sharp shears to improve the plant's aesthetic and prevent further stress.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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Root Rot (Phytophthora)

Overwatering in poorly draining soil leads to oxygen depletion in the rhizosphere. This causes root decay, which physically prevents the boxwood from absorbing water, mimicking drought symptoms through browning tips.

Common

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How to confirm: Gently lift a small section of soil to see if the roots appear dark, slimy, or lack fine feeder roots.

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1 Immediately reduce watering frequency and ensure the plant is in a container with excellent drainage to stop further root decay.

2 Repot the boxwood into a fresh, well-draining medium amended with perlite to increase soil aeration and oxygen levels in the rhizosphere.