Calatheas (and their close relatives marantas and ctenanthe) have some of the most beautiful leaves in the houseplant world — and a reputation for being dramatic. Their leaves fold up at night like praying hands, and they crisp up at the edges when unhappy. The good news: they need exactly three things, and they're all manageable.

1. Water: Filtered, and Never Soggy

Calatheas are famously sensitive to tap water. Chlorine, fluoride, and dissolved minerals build up in the leaf tips and cause the classic brown crispy edges. Use filtered, distilled, or rain water if your tap water is hard. Keep the soil lightly and evenly moist — water when the top inch or two dries, but never let it sit in a puddle.

2. Humidity: Higher Than You Think

Calatheas want 50-60%+ humidity. In dry indoor air (especially winter with heating on), leaf edges brown regardless of watering. A humidifier near the plant is the most reliable fix; a pebble tray helps; grouping plants together helps a little. Misting provides only a temporary boost.

3. Light: Bright, Indirect — Never Direct Sun

Calatheas live on shady forest floors. They want bright, indirect light (a few feet from an east or north window, or shaded from direct sun). Direct sun bleaches and scorches their patterned leaves in hours. Too little light, and growth stalls and colors fade.

Temperature and Drafts

Keep them warm — 18-27°C (65-80°F) — and away from cold drafts, heat vents, and sudden temperature swings. A calathea near a frequently opened door or an AC vent will drop leaves out of protest.

The "Crispy Edges" Diagnosis

  • Brown crispy edges + dry soil: underwatering or low humidity.
  • Brown crispy edges + wet soil: overwatering is damaging the roots.
  • Brown crispy edges + tap water: water quality — switch to filtered.
  • Curling leaves: usually thirst or heat stress; check soil and room.
  • Yellowing leaves: often overwatering or too much direct light.

Pests

Calatheas are spider-mite magnets, especially in dry air. Check leaf undersides regularly; at the first sign of webbing, raise humidity and treat with insecticidal soap.

Not sure which prayer plant you have? Identify it with the AI Planter analyzer — calatheas, marantas, and ctenanthe all have slightly different care notes.

See also: Calathea leaves fold at night normally; Leaves Curling Up vs. Down: What Each Direction Means explains what is normal and what is not.