Why does your Rhododendron concinnum have brown leaf tips? Diagnose the cause and fix it with our step-by-step guide.
Rhododendrons are sensitive to high levels of soluble salts. When fertilizers or hard water minerals accumulate in the substrate, they create osmotic stress that draws moisture out of the leaf margins, causing tip burn.
As an acid-loving plant with shallow root systems, Rhododendron concinnum cannot tolerate significant drying of the substrate. When moisture is depleted, the plant sacrifices leaf margins to preserve the core hydration.
Excessive moisture in poorly draining soil leads to fungal pathogens attacking the root system. When roots die, they can no longer transport water to the tips of the leaves, resulting in necrotic brown edges.
Strong, drying winds can increase the transpiration rate beyond the root system's ability to supply water. This is particularly common in compact varieties if they are placed in drafty or exposed locations.
Your plant might also be experiencing one of these issues:
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