Camellia Oedema: Corky Leaf Blisters from Overwatering

Those corky, blister-like bumps on the undersides of your camellia leaves are classic oedema (edema)—a physiological disorder, not a disease. It occurs when roots absorb water faster than leaves can transpire it, causing cells to burst. The result: raised, corky spots that look alarming but are harmless long-term.

Cause and Cure

Your camellias, planted in June with afternoon sun, were likely overwatered during hot weather out of caution. The fix is simple: stop watering so frequently. Let the soil dry between waterings. Also, limb up the overhead tree to increase light and air circulation, which boosts transpiration. As the plants mature and roots establish, symptoms will fade on new growth. No fungicide needed.

Camellia oedema on leaf underside

Camellia oedema close-up