Curling Leaves on calathea
What's Happening
Calathea leaves curl downward as a physiological response to water deficit - either from underwatering or low humidity preventing adequate moisture uptake. This nyctinastic movement reduces leaf surface area exposed to dry air, conserving water through decreased transpiration. Key diagnostic differentiator: underwatering causes uniform curling with soil dryness below 2 inches, while humidity-related curling occurs with moist soil but dry air (<50% RH). Rootbound plants may also curl as water uptake becomes insufficient despite adequate watering frequency.
How to Fix It
- 1
Perform finger test: Insert finger 2 inches deep; if dry, water thoroughly until drainage
- 2
Check drainage holes for blockage preventing proper water absorption
- 3
Increase humidity to 60%+ using humidifier if soil is moist but leaves curl
- 4
Repot if roots circle pot bottom (rootbound) into container 1-2 inches larger
- 5
Monitor for 7-10 days after adjustments - new growth indicates recovery
How to Prevent It
Establish consistent watering schedule based on soil moisture rather than calendar days. Water when top 1-2 inches of soil become dry. Maintain 60-80% humidity to prevent moisture stress even with adequate soil watering. Check root system annually to prevent binding.