Troubleshooting
Begonia 'Black Velvet' problems — and how to fix them
Begonia 'Black Velvet' (Begonia rex-cultorum 'Black Velvet') 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.
Powdery mildew
Rex begonias are mildew-prone in stagnant, humid air. Improve airflow, keep foliage dry, and remove affected leaves.
Leaf scorch
Direct sun burns and fades the dark velvety leaves. Move to bright indirect light.
Rhizome and crown rot
Overwatering or a buried rhizome causes soft, blackened rot. Keep the rhizome surface-set and let the topsoil dry between waterings.
Winter leaf drop
Rex begonias may shed leaves and semi-dormant in winter. Reduce water, hold off feeding, and keep them warm; fresh growth returns in spring.
Prevent begonia 'black velvet' problems before they start
Most begonia 'black velvet' issues are care-mismatch, not bad luck. Dial in the basics:
- Common rex begonia problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Begonia 'Black Velvet' watering schedule
- Begonia 'Black Velvet' light requirements
- Best soil mix for begonia 'black velvet'
- Begonia 'Black Velvet' temperature & humidity
- Full begonia 'black velvet' care guide
Looking for the species overview? Begonia — the full care guide.
Begonia 'Black Velvet' problems — FAQ
Why is my begonia 'black velvet' powdery mildew?
Rex begonias are mildew-prone in stagnant, humid air. Improve airflow, keep foliage dry, and remove affected leaves.
Why is my begonia 'black velvet' leaf scorch?
Direct sun burns and fades the dark velvety leaves. Move to bright indirect light.
Why is my begonia 'black velvet' rhizome and crown rot?
Overwatering or a buried rhizome causes soft, blackened rot. Keep the rhizome surface-set and let the topsoil dry between waterings.
Why is my begonia 'black velvet' winter leaf drop?
Rex begonias may shed leaves and semi-dormant in winter. Reduce water, hold off feeding, and keep them warm; fresh growth returns in spring.