Troubleshooting
Bracted Begonia problems — and how to fix them
Bracted Begonia (Begonia involucrata) 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
Begonia involucrata is particularly susceptible to powdery mildew in low-airflow environments; improve ventilation and avoid overhead watering, treating outbreaks with a dilute potassium bicarbonate spray.
Root rot (Pythium / Rhizoctonia)
Overwatering or compacted soil leads to stem base collapse; allow the top compost layer to dry between waterings and ensure the pot has adequate drainage holes.
Prevent bracted begonia problems before they start
Most bracted begonia issues are care-mismatch, not bad luck. Dial in the basics:
Bracted Begonia problems — FAQ
Why is my bracted begonia powdery mildew?
Begonia involucrata is particularly susceptible to powdery mildew in low-airflow environments; improve ventilation and avoid overhead watering, treating outbreaks with a dilute potassium bicarbonate spray.
Why is my bracted begonia root rot (pythium / rhizoctonia)?
Overwatering or compacted soil leads to stem base collapse; allow the top compost layer to dry between waterings and ensure the pot has adequate drainage holes.