Calathea Leaves Curl at Night: Normal or Sign of Trouble?

If you walk into your living room at night and find your calathea leaves curled or folded upward, the most likely answer is — it's completely normal. Calatheas are 'prayer plants' that move on a circadian rhythm. But sometimes the curling means something else.

The Normal Nyctinastic Movement

Calatheas, marantas, and ctenanthes have a small joint at the base of each leaf called a pulvinus. At night, water pressure in the pulvinus shifts and the leaves fold upward like praying hands. They unfurl again at sunrise. This is healthy behavior and means your light cycle is working.

When Curling Is a Problem

  • Leaves stay curled during the day: Underwatering or low humidity.
  • Edges curling inward (taco-shape): Severe dehydration or salt buildup from tap water.
  • Curling combined with crispy brown edges: Humidity below 40% — use a humidifier.
  • Curling only on one side of the plant: Uneven light. Rotate the pot 90° weekly.

Frequently asked questions

Why do calathea leaves move so dramatically at night?

The pulvinus joint at the base of each leaf changes water pressure on a circadian cycle, lifting and folding the leaf. It's an evolved response to light and dark on the rainforest floor.

Should I worry if my calathea isn't moving at night?

Yes — a calathea that no longer moves is stressed. Likely causes: too little light, too cold, or root damage. Address light and water first.

Do all prayer plants move at night?

Most species in the Marantaceae family do — including calathea, maranta, stromanthe, and ctenanthe. Some move dramatically, others subtly. Healthy ones all show some movement.

Sources and references

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