Troubleshooting
Mapu Fan Palm problems — and how to fix them
Mapu Fan Palm (Licuala mattanensis 'Mapu') 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.
Leaf tip and edge browning
By far the most common complaint. Causes include low humidity (below 60% RH), fluoride toxicity from tap water, cold draughts from air conditioning, and underwatering. Switch to rainwater or filtered water, raise humidity actively with a humidifier, and keep the plant well away from heating and cooling vents.
Spider mites
The pleated fan leaves provide excellent habitat for spider mites in dry indoor conditions. Look for fine webbing in pleats and stippled, bronzed leaf surfaces. Increase humidity immediately, shower the foliage weekly, and treat with insecticidal soap or neem oil at 7-day intervals for at least four applications.
Failure to produce new leaves
If no new leaf is emerging over 3–4 months during the growing season, likely causes are low light, low temperatures, or root binding. Check that the plant is not root-bound (if so, repot in spring), move to a brighter position (still indirect), ensure temperatures stay above 20°C, and resume a gentle feeding programme.
Prevent mapu fan palm problems before they start
Most mapu fan palm issues are care-mismatch, not bad luck. Dial in the basics:
Looking for mapu fan palm in general rather than its problems? Read the full mapu fan palm care guide — light, water, soil and feeding.
Mapu Fan Palm problems — FAQ
Why is my mapu fan palm leaf tip and edge browning?
By far the most common complaint. Causes include low humidity (below 60% RH), fluoride toxicity from tap water, cold draughts from air conditioning, and underwatering. Switch to rainwater or filtered water, raise humidity actively with a humidifier, and keep the plant well away from heating and cooling vents.
Why is my mapu fan palm spider mites?
The pleated fan leaves provide excellent habitat for spider mites in dry indoor conditions. Look for fine webbing in pleats and stippled, bronzed leaf surfaces. Increase humidity immediately, shower the foliage weekly, and treat with insecticidal soap or neem oil at 7-day intervals for at least four applications.
Why is my mapu fan palm failure to produce new leaves?
If no new leaf is emerging over 3–4 months during the growing season, likely causes are low light, low temperatures, or root binding. Check that the plant is not root-bound (if so, repot in spring), move to a brighter position (still indirect), ensure temperatures stay above 20°C, and resume a gentle feeding programme.