Troubleshooting
Fireflush Rex Begonia problems — and how to fix them
Fireflush Rex Begonia (Begonia 'Fireflush') 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 particularly susceptible to powdery mildew; ensure good air circulation, avoid cold draughts, and do not wet the foliage — treat early infections with a potassium bicarbonate spray.
Crown and rhizome rot
Water pooling in the crown or persistent soggy compost causes rapid collapse of the central growing point; always water at the pot edge or bottom-water, and ensure free drainage.
Spider mites
Low humidity encourages spider mite infestations, visible as fine webbing and stippled, dull leaves; raise humidity and treat with insecticidal soap or neem oil, repeating every 5–7 days.
Prevent fireflush rex begonia problems before they start
Most fireflush rex begonia issues are care-mismatch, not bad luck. Dial in the basics:
Fireflush Rex Begonia problems — FAQ
Why is my fireflush rex begonia powdery mildew?
Rex begonias are particularly susceptible to powdery mildew; ensure good air circulation, avoid cold draughts, and do not wet the foliage — treat early infections with a potassium bicarbonate spray.
Why is my fireflush rex begonia crown and rhizome rot?
Water pooling in the crown or persistent soggy compost causes rapid collapse of the central growing point; always water at the pot edge or bottom-water, and ensure free drainage.
Why is my fireflush rex begonia spider mites?
Low humidity encourages spider mite infestations, visible as fine webbing and stippled, dull leaves; raise humidity and treat with insecticidal soap or neem oil, repeating every 5–7 days.