Calathea Leaves Curling? Here's How to Fix It Fast

Why Are My Calathea Leaves Curling?

If you've noticed your calathea leaves curling inward, you're not alone. Calatheas are notoriously expressive plants — they'll let you know immediately when something isn't right. The good news? Curling leaves are your plant's early warning system, and with a little detective work, you can usually fix the problem quickly.

In this guide, we'll walk through every possible cause of calathea leaf curl, how to identify which one is affecting your plant, and exactly what to do about it.

The Most Common Causes of Calathea Leaves Curling

1. Underwatering

The number one reason calathea leaves curl is lack of moisture. When a calathea doesn't get enough water, it curls its leaves inward to reduce the surface area exposed to air — essentially trying to conserve whatever moisture it has left.

Check the soil before anything else. If the top two inches feel dry or the soil is pulling away from the edges of the pot, your calathea is thirsty.

Water thoroughly until it drains from the bottom of the pot
Allow the top inch of soil to dry out between waterings, but never let it dry completely
Consider a consistent watering schedule — calatheas love routine

2. Low Humidity

Calatheas are tropical plants native to the rainforests of South America, where humidity regularly hits 80–90%. Most homes sit around 30–50%, which can cause chronic leaf curling even if your watering routine is perfect.

If the edges of the leaves are also browning along with curling, low humidity is likely the culprit.

Use a plant humidifier near your calathea for the best results
Group your calathea with other plants to create a humidity microclimate
Place the pot on a tray filled with pebbles and water (just don't let the pot sit in the water)
Avoid misting directly — it can encourage fungal issues and doesn't raise humidity consistently

3. Temperature Stress and Cold Drafts

Calatheas are sensitive to temperature fluctuations. Cold drafts from windows, air conditioning vents, or exterior doors can cause leaves to curl rapidly. Similarly, temperatures below 60°F (15°C) will stress your plant significantly.

Check where your calathea is sitting. Is it near an AC vent? A drafty window? Move it to a stable, warm spot where temperatures stay between 65–80°F (18–27°C) consistently.

4. Overwatering and Root Rot

While underwatering is more common, overwatering can also cause calathea leaves to curl. When roots are waterlogged and begin to rot, they can no longer transport water and nutrients effectively — which ironically causes the plant to show the same drought-stress symptoms.

Signs that overwatering (rather than underwatering) is to blame include:

Soil that stays wet for more than a week after watering
A musty smell coming from the pot
Yellowing leaves alongside the curling
Soft, dark roots when you check the root ball

If you suspect root rot, remove the plant from its pot, trim any black or mushy roots with clean scissors, and repot in fresh, well-draining soil.

5. Water Quality Issues

Calatheas are famously sensitive to the minerals and chemicals found in tap water — particularly fluoride and chlorine. These can build up in the soil over time and cause leaf curl, browning tips, and general decline.

Switch to one of these alternatives:

Filtered water — a simple pitcher filter works well
Rainwater — calatheas absolutely love it
Distilled water — the gold standard but less sustainable long-term
Tap water left overnight — allows chlorine to dissipate, though it won't remove fluoride

6. Too Much Direct Sunlight

Calatheas prefer bright, indirect light. If your plant is getting direct sun exposure — even for just a few hours — the leaves may curl and develop crispy, bleached patches as they try to protect themselves from the intense light.

Move your calathea to a spot with filtered or indirect light. An east-facing window is often ideal. If your only option is a bright south or west window, use a sheer curtain to diffuse the light.

7. balanced liquid fertilizer Burn

Over-fertilizing or using a fertilizer that's too concentrated can cause salt buildup in the soil, which draws moisture away from the roots. This leads to leaf curl and brown tips that look similar to underwatering symptoms.

Stick to a diluted, balanced liquid fertilizer (at half the recommended strength) applied once a month during the growing season (spring and summer). Avoid fertilizing in fall and winter when growth slows.

How to Diagnose the Problem: A Step-by-Step Approach

Check the soil moisture first — stick your finger two inches deep. Dry? Water it. Soggy? Hold off and check roots.
Assess the humidity — grab an inexpensive hygrometer to measure your home's humidity levels.
Consider the location — is the plant near a vent, window, or heater? Move it if so.
Review your watering habits — are you using tap water? Watering inconsistently?
Look at the whole picture — yellowing suggests overwatering or root rot; browning tips with curling often points to low humidity or water quality.

Preventative Care: Keeping Calathea Leaves Flat and Healthy

The best treatment is prevention. Once you've dialed in your calathea's environment, maintaining consistent conditions is key. Here's a quick summary of ideal care conditions:

Light: Bright, indirect light — no direct sun
Water: Filtered or rainwater, when the top inch of soil is dry
Humidity: 60% or higher when possible
Temperature: 65–80°F (18–27°C), away from drafts
Soil: Well-draining mix with good moisture retention
Fertilizer: Half-strength liquid fertilizer, monthly in spring and summer only

Will Curled Calathea Leaves Recover?

In most cases, yes. Once you identify and correct the issue, calathea leaves will often unfurl within 24–48 hours. Some older, severely curled leaves may not fully recover, but new growth should come in looking healthy and flat.

Be patient — calatheas can take a little time to settle after stress. As long as you see new leaves emerging, your plant is on the right track.

Frequently Asked Questions

Why are my calathea leaves curling inward?

The most common cause is underwatering — calatheas curl their leaves to conserve moisture when the soil is too dry. Other causes include low humidity, temperature stress, overwatering, or poor water quality.

How do I fix curling calathea leaves from underwatering?

Water your calathea thoroughly until water drains from the bottom, then maintain a consistent schedule, allowing only the top inch of soil to dry between waterings — never let it dry out completely.

Does low humidity cause calathea leaves to curl?

Yes, calatheas are tropical plants that thrive at 80–90% humidity, and most homes only reach 30–50%, which can cause chronic curling. Using a humidifier or placing the pot on a pebble tray with water can help.

Can overwatering cause calathea leaves to curl?

Yes, overwatering can cause root rot, which prevents the plant from absorbing water and nutrients, causing the same curling symptoms as underwatering. Signs include soggy soil, musty smell, yellowing leaves, and dark mushy roots.

What temperature do calatheas need to prevent leaf curling?

Calatheas need stable temperatures between 65–80°F (18–27°C). Keep them away from cold drafts, AC vents, and drafty windows, as temperatures below 60°F can cause rapid leaf curling.