Troubleshooting
Taiwan Begonia problems — and how to fix them
Taiwan Begonia (Begonia formosana) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
The large, dense leaves are prone to powdery mildew in low-airflow conditions; improve ventilation and avoid wetting the foliage when watering.
Rhizome rot
Overwatering or poorly draining compost causes the fleshy rhizome to blacken and collapse; use a gritty mix and ensure pots drain freely after every watering.
Prevent taiwan begonia problems before they start
Most taiwan begonia issues are care-mismatch, not bad luck. Dial in the basics:
Taiwan Begonia problems — FAQ
Why is my taiwan begonia powdery mildew?
The large, dense leaves are prone to powdery mildew in low-airflow conditions; improve ventilation and avoid wetting the foliage when watering.
Why is my taiwan begonia rhizome rot?
Overwatering or poorly draining compost causes the fleshy rhizome to blacken and collapse; use a gritty mix and ensure pots drain freely after every watering.