Plant care guide
Calathea Leaves Curling: Water, Humidity, Heat or Roots?
Updated · First published
Why are my Calathea leaves curling?
Calathea leaves curl inward when they are short of water: from dry mix, dry air, heat or direct sun, cold drafts, or roots damaged by wet mix. Night folding and rolled new leaves are normal and need no fix.
What to do first
Check the mix well below the surface before anything else. Water a dry pot thoroughly, inspect the roots of a wet one, then check humidity, direct sun, drafts and water quality.
Quick answer: Curling on a calathea usually points to a water shortage in the leaves. The usual triggers are dry mix, dry air, heat or direct sun, and cold drafts. Roots damaged by wet mix can cause the same curl, so check the mix before you water.
Most plants sold as calathea are now classified as Goeppertia. The RHS notes that many former calatheas now sit in Goeppertia, Ctenanthe or Stromanthe. The care below applies to the common species such as peacock plant, zebra plant and rose-painted calathea.
Normal Movement Versus Curling
Calatheas move every day. The RHS calathea guide describes the nyctinastic habit: leaves open flat in daylight and flex upwards at night. NC State Extension says Goeppertia makoyana folds its foliage in the evening and reopens at sunrise.
NC State also notes that new G. makoyana leaves are rolled up as they grow. A tight scroll on a new stalk will open by itself.
Stress curling looks different. Mature leaf blades roll inward along their length and stay rolled at midday. They may also look dull, limp or crisp at the edges.
The Diagnosis: What Causes Calathea Leaves to Curl
| What you find | Likely cause |
|---|---|
| Mix dry well below the surface, pot light | Underwatering |
| Curling with crisp brown edges, dry room air | Low humidity |
| Rolling, bleaching and crisping in a hot or sunny spot | Heat stress or direct sun |
| Dry edges or yellowing near a door, vent or cold window | Drafts |
| Curling or wilting while the mix stays wet | Root damage |
| Brown tips and margins, tap water or heavy feeding | Fluoride or fertilizer salts |
Underwatering. NC State says the mix should stay moist but not wet or soggy. UF/IFAS Extension’s Calathea guide lists wilted leaves as a sign of drought stress.
Low humidity. NC State gives a humidity level of 60% for G. makoyana and above 60% for G. zebrina. UF/IFAS states that calatheas keep their appearance better indoors at 40–60%. Iowa State Extension notes home humidity can fall to 10–20 percent in winter.
Heat and sun. The RHS houseplant problems page lists wilting, rolling, bleaching and crisping leaves as signs of heat stress. The RHS also advises keeping calatheas out of direct sunlight.
Temperature swings and drafts. NC State recommends 18–24 °C (65–75 °F) for these species and warns against cold drafts and sudden changes. The RHS gives 16–21 °C (61–70 °F).
Root damage. UF/IFAS lists root pathogens alongside drought as a cause of wilted calathea leaves. The RHS warns that roots standing in water can easily rot.
Water quality. NC State recommends distilled or rainwater because fluoride in tap water can brown calathea leaves. This shows more as browning than curling, but the two often appear together.
The Solution: How to Stop Calathea Leaves Curling
1. Check soil moisture properly
Push a finger or a wooden skewer well below the surface. The top of the mix can feel dry while the root zone is wet, and the reverse.
UF/IFAS advises letting the surface of the mix dry slightly before watering. When you water, wet the whole root ball until water runs from the drainage hole. Then empty the saucer.
2. Inspect the roots if the mix is wet
If the leaves curl or droop while the mix is wet, slide the plant out of its pot. Firm, pale roots are healthy. Dark, soft roots point to rot. Cut those away and repot in fresh, well-drained mix. The calathea drooping guide covers this step in more detail.
3. Raise humidity
Iowa State Extension recommends humidifiers, grouping plants and pebble trays. Keep the pot base above the water line on a pebble tray. Iowa State finds misting impractical, because leaves dry quickly and it would be needed several times a day.
Put a hygrometer next to the plant. It tells you whether a change actually raised humidity where the leaves are.
4. Remove heat, sun and drafts
Move the plant to a bright spot out of direct sun. Keep it away from radiators, heating vents, air conditioners, exterior doors and cold glass at night.
5. Switch to rainwater or distilled water
Follow NC State’s recommendation if brown tips appear alongside the curl. Our tap water guide explains how to check whether your supply is the problem.
Prevention: Keep Calathea Leaves Flat
Use a mix that drains. NC State recommends a moist, well-drained potting mix with high organic matter and perlite to improve drainage.
Water by condition, not schedule. NC State advises reducing watering in winter. The RHS suggests letting the surface dry before rewetting in the colder months, without letting the compost dry out completely.
Feed only in the growing season. NC State suggests a balanced fertilizer every four weeks in the growing season and none in winter.
Repot in spring. The RHS suggests repotting every few years in spring or summer.
Frequently Asked Questions
Can curled Calathea leaves uncurl?
Crisp, brown tissue will not recover. A leaf that is still green and pliable may open again once the cause is fixed. The next new leaves are the clearer test.
Should I mist my Calathea?
Misting is a weak tool. Iowa State Extension notes foliage dries quickly after misting. A humidifier, grouped plants or a pebble tray raises humidity more steadily.
Why are my Calathea leaves curling and turning yellow?
Check the roots. UF/IFAS lists overwatering among the causes of leaf yellowing, and the RHS links old and new leaves yellowing together with overwatering. Curling over wet mix fits that pattern.
How do I know if it is humidity or water?
Check the mix first. Dry mix with curling points to underwatering. Moist mix with curling and crisp edges in dry room air points to humidity. A hygrometer reading confirms it.
Other calathea guides are linked from the calathea hub, and our Calathea and Goeppertia care guide covers year-round care.
Related guides
Other calathea problems we cover: water quality sensitivity, leaf movement, sunburn treatment, root rot, yellow leaves.
References
- NC State Extension Gardener Plant Toolbox: Goeppertia makoyana
- NC State Extension Gardener Plant Toolbox: Goeppertia zebrina
- UF/IFAS Extension: Cultural Guidelines for Commercial Production of Interiorscape Calathea (ENH1030)
- RHS: How to grow calatheas
- RHS: How to help a poorly houseplant
- Iowa State University Extension: How can I raise the relative humidity indoors for my houseplants?
How this guide was put together: NC State Extension, UF/IFAS Extension, Iowa State University Extension and RHS guidance.