Troubleshooting
Carnation of India problems — and how to fix them
Carnation of India (Ervatamia coronaria) 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.
Scale insects
Sticky honeydew deposits and sooty mould on leaves indicate scale insect infestations on stems and leaf undersides. Scrape off scales with a soft brush dipped in methylated spirits, and follow with two or three weekly applications of horticultural oil or insecticidal soap.
Leaf yellowing in winter
A combination of low light, cold draught, and overwatering in winter causes yellowing and leaf drop. Move to the brightest frost-free position available, reduce watering, and keep temperatures above 15°C. Some winter defoliation is normal at lower temperatures.
Failure to flower
Insufficient light is the most common reason. Ensure at least 4-5 hours of bright light daily. Also review nitrogen fertiliser use — excessive nitrogen encourages lush foliage at the expense of flowers. Switching to a phosphorus/potassium-rich formula in summer promotes blooming.
Prevent carnation of india problems before they start
Most carnation of india issues are care-mismatch, not bad luck. Dial in the basics:
Looking for carnation of india in general rather than its problems? Read the full carnation of india care guide — light, water, soil and feeding.
Carnation of India problems — FAQ
Why is my carnation of india scale insects?
Sticky honeydew deposits and sooty mould on leaves indicate scale insect infestations on stems and leaf undersides. Scrape off scales with a soft brush dipped in methylated spirits, and follow with two or three weekly applications of horticultural oil or insecticidal soap.
Why is my carnation of india leaf yellowing in winter?
A combination of low light, cold draught, and overwatering in winter causes yellowing and leaf drop. Move to the brightest frost-free position available, reduce watering, and keep temperatures above 15°C. Some winter defoliation is normal at lower temperatures.
Why is my carnation of india failure to flower?
Insufficient light is the most common reason. Ensure at least 4-5 hours of bright light daily. Also review nitrogen fertiliser use — excessive nitrogen encourages lush foliage at the expense of flowers. Switching to a phosphorus/potassium-rich formula in summer promotes blooming.