Troubleshooting
Two-Petal Begonia problems — and how to fix them
Two-Petal Begonia (Begonia dipetala) 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.
Botrytis (grey mould)
High humidity combined with poor airflow encourages Botrytis cinerea to colonise spent flowers and damaged leaves; remove affected material promptly and increase ventilation.
Vine weevil larvae
C-shaped cream larvae fed on fibrous roots cause sudden wilting; inspect roots when repotting and treat with a nematode drench (Steinernema kraussei) in late summer.
Prevent two-petal begonia problems before they start
Most two-petal begonia issues are care-mismatch, not bad luck. Dial in the basics:
Two-Petal Begonia problems — FAQ
Why is my two-petal begonia botrytis (grey mould)?
High humidity combined with poor airflow encourages Botrytis cinerea to colonise spent flowers and damaged leaves; remove affected material promptly and increase ventilation.
Why is my two-petal begonia vine weevil larvae?
C-shaped cream larvae fed on fibrous roots cause sudden wilting; inspect roots when repotting and treat with a nematode drench (Steinernema kraussei) in late summer.