Why are my Calathea leaves curling?

Your Calathea leaves are curling because the plant is thirsty. Calatheas roll their leaves inward to shrink surface area and slow water loss, and this is almost always a sign of underwatering or low humidity. Check the soil first: if the top inch is dry and the edges feel crisp, the plant needs water and moisture, not less.

Most likely cause

Underwatering and low humidity are the top reasons a Calathea curls. The leaf rolls inward as a protective response to conserve the water it has left. You can confirm this in seconds.

Press a finger into the soil. If the top inch is dry, the pot feels light, and leaf edges are crisping or browning, the plant is dehydrated. Curling that worsens during dry afternoons or near heaters points the same way. Calatheas are native to humid tropical floors and react fast when the air gets dry.

Other causes

If the soil is moist and humidity is fine, work down this ranked list.

Low humidity: Edges curl and brown evenly across many leaves. Confirm with a cheap hygrometer reading below 40 percent.
Too much direct light or heat: Curling plus faded or scorched patches on sun-facing leaves. Move it out of direct sun.
Tap-water minerals: Brown, crispy edges with curling that builds over weeks. Likely fluoride, chlorine, or salt buildup from hard tap water.
Spider mites: Curling with fine webbing and tiny pale speckles. Check leaf undersides with a magnifier for moving dots.

How to fix it

Water thoroughly until it drains from the bottom, then let the top inch dry before watering again.
Raise humidity to 50 to 60 percent with a humidifier, pebble tray, or by grouping plants.
Move the plant to bright indirect light, away from direct sun, heaters, and cold drafts.
Switch to distilled water, rainwater, or tap water left out overnight to off-gas chlorine.
Inspect leaf undersides for spider mites and rinse or treat with insecticidal soap if found.
Trim fully crisped leaf tips and wait for healthy new growth.

Symptom	Likely cause	First fix
Curl + dry soil + crisp edges	Underwatering	Water deeply
Even browning edges	Low humidity	Add humidifier
Scorched, faded patches	Too much light or heat	Move from direct sun
Slow brown-edge buildup	Tap-water minerals	Use distilled water
Webbing + speckling	Spider mites	Treat undersides

Frequently asked questions

Will curled Calathea leaves uncurl again?

Yes, if you catch it early. After you rehydrate the plant and raise humidity, leaves that curled from thirst usually relax within hours to a day. Leaves that already browned and crisped will not fully recover, but new growth comes in healthy.

How often should I water a Calathea?

Water when the top inch of soil feels dry, often every 5 to 7 days. Calatheas like soil that stays lightly moist but never soggy. Check by touch rather than on a fixed schedule, since light and temperature change how fast the pot dries out.

Is my Calathea curling from too much or too little water?

Curling with dry soil and crispy edges means too little water. Curling with constantly wet soil, yellowing, and a musty smell points to overwatering and root rot. Check the soil moisture first to tell them apart.

Do Calatheas curl their leaves at night?

Yes, and that is normal. Calatheas raise and curl their leaves each evening and open them again by morning. This daily movement, called nyctinasty, is healthy. Worry only if leaves stay curled during the day.

What humidity does a Calathea need?

Aim for 50 to 60 percent humidity or higher. Below about 40 percent, leaves often curl and brown at the edges. A pebble tray, a nearby humidifier, or grouping plants together raises local humidity.

Should I use distilled water for my Calathea?

It helps if your tap water is hard or heavily treated. Calatheas are sensitive to fluoride, chlorine, and salt buildup, which causes brown edges. Use distilled water, rainwater, or tap water left out overnight to off-gas chlorine.