Why does your Rhododendron argyrophyllum have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
High soil pH (alkaline conditions) prevents this species from absorbing iron, leading to interveinal chlorosis where leaf veins remain green but the rest of the leaf turns yellow. This is common in Rhododendrons if the substrate is not acidic enough.
Excessive moisture or poor drainage in heavy soils leads to fungal pathogens attacking the root system. This inhibits water and nutrient transport, causing the characteristic yellowing of the foliage.
A lack of available nitrogen in the growing medium causes older, lower leaves to turn uniformly yellow before progressing upward. This is often due to depleted soil nutrients or leaching from heavy rainfall.
While Rhododendrons prefer moisture, prolonged dry periods cause the plant to shed chlorophyll and wilt. This can lead to a pale yellow appearance followed by leaf drop.
Your plant might also be experiencing one of these issues:
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