Why does your Rieger Begonia have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Rieger Begonias are highly susceptible to rhizome rot if the substrate remains saturated. Excess moisture deprives roots of oxygen, causing the plant to shed leaves as a stress response to failing root systems.
These begonias are tropical perennials that thrive in stable, warm environments. Sudden exposure to cold drafts from windows or air conditioning units can cause the plant to drop leaves rapidly to conserve energy.
High humidity combined with poor air circulation can trigger fungal infections like Botrytis blight, which often manifests as rapid leaf senescence and drop.
A lack of available nitrogen prevents the plant from maintaining foliage, leading to chlorosis followed by the shedding of older leaves.
Your plant might also be experiencing one of these issues:
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