Why does your Begonia rex-cultorum have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Rex Begonias are highly sensitive to moisture fluctuations. Overwatering causes root rot which leads to sudden wilting and leaf drop, while underwatering dries out the rhizome and triggers a survival mechanism to shed foliage.
These plants are tropical and cannot tolerate sudden drops in temperature. Exposure to cold window drafts or air conditioning vents causes the plant to rapidly drop leaves to protect its core.
Rex Begonias require high ambient humidity to maintain turgor pressure in their large, thin leaves. When the air is too dry, the plant may shed leaves to reduce the surface area from which moisture can evaporate.
High humidity combined with poor air circulation can lead to fungal infections. The fungus attacks the leaf tissue, causing rapid decay and subsequent shedding of the foliage.
Your plant might also be experiencing one of these issues:
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