Rhododendron hunnewellianum Brown Leaf Tips - Causes & Fixes

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Salt/Mineral Accumulation

Rhododendrons are sensitive to high levels of salts from tap water or synthetic fertilizers. These minerals accumulate in the leaf margins, causing osmotic stress and desiccation of the tips.

Very Common

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How to confirm: Check if you use well water or hard tap water, and look for white crusty deposits on the soil surface.

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1 Flush the soil thoroughly with distilled or rainwater to leach out accumulated mineral salts and prevent further tip burn.

2 Switch to a low-salt water source and use an acid-loving fertilizer specifically formulated for your species to maintain proper pH.

FoxFarm Happy Frog Acid Loving Plant Fertilizer

Organic

$22

In Stock

3 Prune away the dead, brown leaf tips using sterilized 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 Drought Stress

Rhododendron hunnewellianum has a shallow, fibrous root system that is highly susceptible to drying out. When moisture levels drop too low, the plant cannot transport water to the furthest leaf extremities.

Very Common

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How to confirm: Insert your finger 2 inches into the soil to check if it feels dry despite recent watering.

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1 Check the soil moisture levels immediately using a moisture meter to confirm if the root zone has reached critical dryness.

GROWIT Analog Soil Moisture Meter

Water Meters

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2 Apply a deep, slow watering to ensure moisture reaches the shallow, fibrous root system, and consider using a mulch layer to prevent future evaporation.

3 To help the plant recover from drought stress, apply a liquid seaweed fertilizer to boost nutrient uptake and promote root resilience.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

$32

In Stock

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Fungal Leaf Scorch (Phytophthora)

While often associated with root rot, certain fungal pathogens can cause leaf margin necrosis during periods of high humidity followed by sudden dry spells.

Common

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How to confirm: Inspect the base of the stems for any signs of dark, water-soaked lesions or mushy bark.

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1 Apply a fungicide to control the Phytophthora pathogen and prevent the spread of leaf necrosis.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

2 Improve air circulation around the plant and avoid overhead watering to reduce the humidity levels that favor fungal growth.

3 Prune and dispose of any heavily affected leaves to reduce the inoculum load in the environment.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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Wind Desiccation

Exposure to hot, dry winds can strip moisture from the leaf edges faster than the roots can replace it, a common issue for this species in exposed garden locations.

Common

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How to confirm: Note if the brown tips correlate with recent periods of high wind or low humidity levels.

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1 Relocate the plant to a sheltered area or use a windbreak to protect the foliage from hot, drying gusts.

2 Increase local humidity around the foliage by using a fine mist spray to prevent further moisture loss from leaf edges.