Rhododendron arboreum Brown Leaf Tips - Causes & Fixes

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Salt Accumulation (Salinity Stress)

Rhododendrons are sensitive to high concentrations of salts from tap water or synthetic fertilizers. Excess sodium or chloride ions accumulate in the leaf margins, causing desiccation and characteristic brown tips.

Very Common

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How to confirm: Check if you are using hard water or if there is a white crusty residue on the soil surface.

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1 Flush the soil thoroughly with distilled or rainwater to leach accumulated salts away from the root zone.

2 Prune away the heavily browned leaf tips using sterilized shears to prevent further aesthetic decline.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

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3 Switch to an acid-loving fertilizer and avoid high-salt synthetic options; consider using organic amendments like FoxFarm Cal Mag to help stabilize the plant.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

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Erratic Watering / Drought Stress

As an acid-loving evergreen, Rhododendron arboreum requires consistent moisture. If the soil dries out completely between waterings, the leaf margins lose turgor and undergo necrosis.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it has become bone dry before the last watering.

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1 Establish a consistent watering schedule to ensure the soil remains moist but not waterlogged, preventing the soil from drying out completely.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Apply a layer of organic mulch or sphagnum moss around the base of the plant to help retain soil moisture and regulate temperature.

Better-Gro Sphagnum Moss 240ci

3.9 L • Sphagnum Moss

$5

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3 Since Rhododendrons are acid-loving plants, ensure the soil pH remains low by using a specialized acid-loving fertilizer if needed.

FoxFarm Happy Frog Acid Loving Plant Fertilizer

Organic

$22

In Stock

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Root Rot (Phytophthora)

Poorly draining soil can lead to root rot, which impairs the tree's ability to transport water to the leaf extremities. This physiological drought manifests as browning tips even if the soil is wet.

Common

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How to confirm: Examine the base of the trunk and the roots for any signs of mushy, dark, or foul-smelling tissue.

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1 Immediately inspect the soil moisture levels using a meter to confirm if the root zone is waterlogged.