Troubleshooting
Large-Flowered Kohleria problems — and how to fix them
Large-Flowered Kohleria (Kohleria grandiflora) 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.
Botrytis (grey mould) on leaves
Caused by water sitting on hairy foliage or poor airflow at high humidity. Never mist the leaves directly; ensure good ventilation and remove affected growth promptly.
Rhizome rot
Overwatering in winter or heavy, poorly draining compost causes rhizomes to rot. Reduce water sharply after stems die back and ensure the pot drains freely.
Bud drop or failure to bloom
Usually caused by temperatures below 16°C (60°F) or sudden cold draughts. Keep away from windows in winter and avoid air-conditioning vents.
Prevent large-flowered kohleria problems before they start
Most large-flowered kohleria issues are care-mismatch, not bad luck. Dial in the basics:
Large-Flowered Kohleria problems — FAQ
Why is my large-flowered kohleria botrytis (grey mould) on leaves?
Caused by water sitting on hairy foliage or poor airflow at high humidity. Never mist the leaves directly; ensure good ventilation and remove affected growth promptly.
Why is my large-flowered kohleria rhizome rot?
Overwatering in winter or heavy, poorly draining compost causes rhizomes to rot. Reduce water sharply after stems die back and ensure the pot drains freely.
Why is my large-flowered kohleria bud drop or failure to bloom?
Usually caused by temperatures below 16°C (60°F) or sudden cold draughts. Keep away from windows in winter and avoid air-conditioning vents.