Troubleshooting
Painted Begonia problems — and how to fix them
Painted Begonia (Begonia picta) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Loss of silver leaf markings
Insufficient light causes the distinctive silver spotting to fade, with leaves becoming uniformly dark green and slightly smaller. Move to a brighter (but still indirect) position to restore the patterning.
Powdery mildew
Like most begonias, B. picta is susceptible to powdery mildew, particularly in conditions with still, dry air. Ensure good ventilation around the plant, water from below, and treat early signs with a potassium bicarbonate-based fungicide.
Root rot in winter
In cool, lower-light winter conditions, the compost stays moist for longer and root rot can develop quickly. Reduce watering frequency significantly in autumn and winter, and avoid placing the pot on cold window ledges in frosty weather.
Prevent painted begonia problems before they start
Most painted begonia issues are care-mismatch, not bad luck. Dial in the basics:
Painted Begonia problems — FAQ
Why is my painted begonia loss of silver leaf markings?
Insufficient light causes the distinctive silver spotting to fade, with leaves becoming uniformly dark green and slightly smaller. Move to a brighter (but still indirect) position to restore the patterning.
Why is my painted begonia powdery mildew?
Like most begonias, B. picta is susceptible to powdery mildew, particularly in conditions with still, dry air. Ensure good ventilation around the plant, water from below, and treat early signs with a potassium bicarbonate-based fungicide.
Why is my painted begonia root rot in winter?
In cool, lower-light winter conditions, the compost stays moist for longer and root rot can develop quickly. Reduce watering frequency significantly in autumn and winter, and avoid placing the pot on cold window ledges in frosty weather.