Troubleshooting
River Nile Rex Begonia problems — and how to fix them
River Nile Rex Begonia (Begonia 'River Nile') 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.
Crown and rhizome rot
Caused by water pooling on the rhizome or consistently waterlogged compost; always water at the pot edge and ensure the growing medium dries slightly between waterings.
Powdery mildew
A frequent issue on rex begonias in stagnant air; improve air circulation and avoid wetting the foliage. Remove affected leaves promptly.
Brown leaf edges
Usually indicates low humidity or exposure to draughts and cold windowpane air; move to a more sheltered position and raise ambient humidity.
Prevent river nile rex begonia problems before they start
Most river nile rex begonia issues are care-mismatch, not bad luck. Dial in the basics:
River Nile Rex Begonia problems — FAQ
Why is my river nile rex begonia crown and rhizome rot?
Caused by water pooling on the rhizome or consistently waterlogged compost; always water at the pot edge and ensure the growing medium dries slightly between waterings.
Why is my river nile rex begonia powdery mildew?
A frequent issue on rex begonias in stagnant air; improve air circulation and avoid wetting the foliage. Remove affected leaves promptly.
Why is my river nile rex begonia brown leaf edges?
Usually indicates low humidity or exposure to draughts and cold windowpane air; move to a more sheltered position and raise ambient humidity.