Calathea Leaf Curling: Why & How to Fix It

By Anouk Beaumont · September 26, 2026

Why Calatheas Are Fussy

Calatheas (now classified as Goeppertia) are tropical understory plants that evolved in humid, shaded rainforest floors. They're sensitive to tap water chemicals, low humidity, and direct sunlight. Understanding their natural habitat is the key to success.

Cause 1: Low Humidity

Calatheas need 60%+ humidity to thrive. Indoor environments often sit at 30-40%, especially in winter. When humidity drops, leaf edges curl inward and turn crispy brown. Fix this with a room humidifier set to 60%, or group multiple tropical plants together to create a microclimate.

Cause 2: Tap Water Chemicals

Calatheas are extremely sensitive to chlorine, chloramine, and fluoride in tap water. These chemicals accumulate in leaf tissue, causing curling, browning edges, and white mineral deposits on the soil surface. Switch to filtered, distilled, or rainwater. Letting tap water sit overnight only removes chlorine, not chloramine or fluoride.

Cause 3: Inconsistent Watering

Calatheas like consistently moist (never soggy) soil. Allowing the soil to dry completely stresses the plant, causing leaves to curl and crisp. Check daily — if the top half-inch is dry, water with room-temperature filtered water. Use a well-draining mix that holds moisture without becoming waterlogged.

Cause 4: Direct Sunlight

In their natural habitat, calatheas grow under dense canopy with zero direct sun. Even filtered afternoon sun can scorch their delicate leaves, causing curling and bleached patches. Place in medium to bright indirect light only — a north-facing window or 4-6 feet from an east window works well.

Cause 5: Cold Drafts

Temperatures below 60°F (15°C) cause immediate leaf curling as a stress response. Keep calatheas away from exterior doors, drafty windows, and AC vents. Ideal range: 65-80°F (18-27°C).