Troubleshooting
Begonia 'Sachsen' problems — and how to fix them
Begonia 'Sachsen' (Begonia rex-cultorum 'Sachsen') 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 especially prone to white powdery coating in humid, still air. Increase airflow, keep foliage dry and remove affected leaves.
Brown, crispy leaf edges
From low humidity or dry air. Raise humidity around the plant and keep moisture even.
Rhizome and crown rot
From overwatering, burying the rhizome or cold wet soil in winter. Plant the rhizome on the surface and cut watering back in winter.
Winter leaf loss or dormancy
Many rex begonias naturally die back in winter. Reduce water, keep warm, and growth resumes in spring.
Prevent begonia 'sachsen' problems before they start
Most begonia 'sachsen' 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 'Sachsen' watering schedule
- Begonia 'Sachsen' light requirements
- Best soil mix for begonia 'sachsen'
- Begonia 'Sachsen' temperature & humidity
- Full begonia 'sachsen' care guide
Looking for the species overview? Begonia — the full care guide.
Begonia 'Sachsen' problems — FAQ
Why is my begonia 'sachsen' powdery mildew?
Rex begonias are especially prone to white powdery coating in humid, still air. Increase airflow, keep foliage dry and remove affected leaves.
Why is my begonia 'sachsen' brown, crispy leaf edges?
From low humidity or dry air. Raise humidity around the plant and keep moisture even.
Why is my begonia 'sachsen' rhizome and crown rot?
From overwatering, burying the rhizome or cold wet soil in winter. Plant the rhizome on the surface and cut watering back in winter.
Why is my begonia 'sachsen' winter leaf loss or dormancy?
Many rex begonias naturally die back in winter. Reduce water, keep warm, and growth resumes in spring.