Troubleshooting
Broad-leaf Horncone problems — and how to fix them
Broad-leaf Horncone (Ceratozamia latifolia) 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.
Leaflet tip browning
The most common cultural problem, caused by low humidity, draughts, fluoride/chlorine in tap water, or root damage. Improve humidity, switch to filtered or rainwater, and check root health. Trim brown tips at an angle for aesthetics but address the underlying cause.
Scale and mealybug
Both pests exploit the broad leaflets. Treat with horticultural oil or neem oil spray on both frond surfaces; for mealybugs, isopropyl alcohol on a cotton swab is effective for spot treatment. Repeat every 2 weeks for 6–8 weeks.
Frond chlorosis in low light
Pale, yellow-green new fronds indicate insufficient light or nutrient deficiency. Move closer to a bright window or add supplemental lighting. Ensure manganese and magnesium levels are adequate in the fertiliser programme.
Prevent broad-leaf horncone problems before they start
Most broad-leaf horncone issues are care-mismatch, not bad luck. Dial in the basics:
Looking for broad-leaf horncone in general rather than its problems? Read the full broad-leaf horncone care guide — light, water, soil and feeding.
Broad-leaf Horncone problems — FAQ
Why is my broad-leaf horncone leaflet tip browning?
The most common cultural problem, caused by low humidity, draughts, fluoride/chlorine in tap water, or root damage. Improve humidity, switch to filtered or rainwater, and check root health. Trim brown tips at an angle for aesthetics but address the underlying cause.
Why is my broad-leaf horncone scale and mealybug?
Both pests exploit the broad leaflets. Treat with horticultural oil or neem oil spray on both frond surfaces; for mealybugs, isopropyl alcohol on a cotton swab is effective for spot treatment. Repeat every 2 weeks for 6–8 weeks.
Why is my broad-leaf horncone frond chlorosis in low light?
Pale, yellow-green new fronds indicate insufficient light or nutrient deficiency. Move closer to a bright window or add supplemental lighting. Ensure manganese and magnesium levels are adequate in the fertiliser programme.