Calathea â common problems
Find the symptom you're seeing for the likely cause and fix.
Likely cause: Low humidity / dry air (and sensitivity to chlorine and fluoride in tap water).
Fix: Raise humidity (pebble tray, bathroom, grouping, misting); use rainwater or filtered water.
Likely cause: Insufficient light.
Fix: Move to a brighter spot out of direct sun, or add grow lights.
Likely cause: Inconsistent watering or poor drainage.
Fix: Keep compost evenly moist in growth; in winter let the surface dry but never fully dry out.
Likely cause: Compost too wet, especially in winter.
Fix: Reduce winter watering; improve air circulation.
Likely cause: Low-humidity conditions.
Fix: Raise humidity; inspect regularly and treat if needed.
Source: extension care guide. Symptoms often overlap â match the conditions (light, watering, humidity) to your situation.
Other houseplants
General care guidance from university extension sources â not a substitute for diagnosing your specific plant and conditions. How this works.