Troubleshooting
Thieme's Begonia problems — and how to fix them
Thieme's Begonia (Begonia thiemei) 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.
Root and stem rot
Caused by overwatering or poor drainage. Stems darken and collapse at the base; affected sections should be cut away and the plant repotted into fresh, dry compost.
Powdery mildew
Grey-white powdery coating on leaves, common in still, humid air with poor circulation. Improve airflow, remove affected leaves, and apply a sulphur-based fungicide if severe.
Prevent thieme's begonia problems before they start
Most thieme's begonia issues are care-mismatch, not bad luck. Dial in the basics:
Thieme's Begonia problems — FAQ
Why is my thieme's begonia root and stem rot?
Caused by overwatering or poor drainage. Stems darken and collapse at the base; affected sections should be cut away and the plant repotted into fresh, dry compost.
Why is my thieme's begonia powdery mildew?
Grey-white powdery coating on leaves, common in still, humid air with poor circulation. Improve airflow, remove affected leaves, and apply a sulphur-based fungicide if severe.