Troubleshooting
Macdougall's Begonia problems — and how to fix them
Macdougall's Begonia (Begonia macdougallii) 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 combination of moderate humidity and poor air circulation in indoor settings predisposes this shrub-like begonia to powdery mildew; improve ventilation and treat at the first signs with a dilute potassium bicarbonate or sulphur-based spray.
Overwatering and stem base rot
Stems rot at the base when compost stays saturated, particularly in cooler winter temperatures; reduce watering frequency significantly from late autumn and ensure pots have efficient drainage.
Prevent macdougall's begonia problems before they start
Most macdougall's begonia issues are care-mismatch, not bad luck. Dial in the basics:
Macdougall's Begonia problems — FAQ
Why is my macdougall's begonia powdery mildew?
The combination of moderate humidity and poor air circulation in indoor settings predisposes this shrub-like begonia to powdery mildew; improve ventilation and treat at the first signs with a dilute potassium bicarbonate or sulphur-based spray.
Why is my macdougall's begonia overwatering and stem base rot?
Stems rot at the base when compost stays saturated, particularly in cooler winter temperatures; reduce watering frequency significantly from late autumn and ensure pots have efficient drainage.