Troubleshooting
Cork Palm problems — and how to fix them
Cork Palm (Microcycas calocoma) 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.
Overwatering and root rot
The number-one killer of Cork Palms in cultivation. Symptoms: yellowing fronds and soft, discoloured caudex at the base. Repot into fresh dry mix, prune dead roots, treat with fungicide, and dramatically reduce watering. The caudex can sometimes recover if caught early.
Scale insects
In warm, humid conditions, scale can infest the fronds and trunk. The corky bark texture can harbour pests. Treat with systemic insecticide or horticultural oil applied thoroughly to all surfaces, including trunk crevices.
Failure to flush (arrested growth)
Extremely slow-growing even for a cycad. If the plant produces no new flush over a full growing season and appears healthy otherwise, check for adequate warmth (minimum 20°C day temperatures) and try a light application of a cycad micronutrient supplement in spring.
Prevent cork palm problems before they start
Most cork palm issues are care-mismatch, not bad luck. Dial in the basics:
Looking for cork palm in general rather than its problems? Read the full cork palm care guide — light, water, soil and feeding.
Cork Palm problems — FAQ
Why is my cork palm overwatering and root rot?
The number-one killer of Cork Palms in cultivation. Symptoms: yellowing fronds and soft, discoloured caudex at the base. Repot into fresh dry mix, prune dead roots, treat with fungicide, and dramatically reduce watering. The caudex can sometimes recover if caught early.
Why is my cork palm scale insects?
In warm, humid conditions, scale can infest the fronds and trunk. The corky bark texture can harbour pests. Treat with systemic insecticide or horticultural oil applied thoroughly to all surfaces, including trunk crevices.
Why is my cork palm failure to flush (arrested growth)?
Extremely slow-growing even for a cycad. If the plant produces no new flush over a full growing season and appears healthy otherwise, check for adequate warmth (minimum 20°C day temperatures) and try a light application of a cycad micronutrient supplement in spring.