Troubleshooting
Reunion Island Begonia problems — and how to fix them
Reunion Island Begonia (Begonia salaziensis) 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.
Heat stress and leaf scorch
Temperatures above 25 °C cause wilting, yellowing, and leaf edge scorch; move to a cooler, well-ventilated position — ideally below 22 °C — and shade from any direct sun.
Powdery mildew
Poor air circulation combined with low light encourages powdery mildew on the leaves; improve airflow, avoid overhead watering, and treat early infections with a dilute potassium bicarbonate spray.
Prevent reunion island begonia problems before they start
Most reunion island begonia issues are care-mismatch, not bad luck. Dial in the basics:
Reunion Island Begonia problems — FAQ
Why is my reunion island begonia heat stress and leaf scorch?
Temperatures above 25 °C cause wilting, yellowing, and leaf edge scorch; move to a cooler, well-ventilated position — ideally below 22 °C — and shade from any direct sun.
Why is my reunion island begonia powdery mildew?
Poor air circulation combined with low light encourages powdery mildew on the leaves; improve airflow, avoid overhead watering, and treat early infections with a dilute potassium bicarbonate spray.