Before adding water
Check when the curling occurs, whether the pot feels light, and whether the mix below the surface is dry, damp or saturated. Photograph the same leaf in the morning and evening. This is more useful than judging the whole plant from one curled leaf.
Normal movement or persistent curling?
Prayer plants change leaf position through the day. A leaf rising at night is different from its blade remaining tightly rolled throughout the day. Leave normal movement alone; do not water simply because leaves point upwards.
If the root ball has become dry
Water slowly and thoroughly, then drain. If water runs straight down a gap beside shrunken compost, check whether the centre actually became moist; more than one careful application may be needed.
Recheck moisture before watering again. A leaf that remains curled is not permission to keep soaking an already wet pot. Severely damaged leaves may not recover.
If the mix is still wet
Damp compost does not prove low humidity is the cause. Check for trapped water, blocked drainage and a pot that stays unusually heavy. Continuing collapse, a soft base or a bad smell warrants a root inspection.
Handle roots gently. Soft, decaying tissue is more concerning than colour alone. Avoid repeatedly unpotting a stable plant, and do not deliberately dry the entire root ball to a crisp as a cure.
Check dry air without overlooking roots
Measure humidity near the plant and note nearby heating. Move it out of a hot air stream. If the air is persistently dry, a clean humidifier may help, but it will not correct waterlogged roots.
Change one non-urgent condition at a time and record it. Otherwise, you will not know which adjustment helped.
Review sun exposure
If curling begins in a hot beam of sunlight, filter the light or choose a sheltered position. Keep useful daylight; moving straight into a dark corner creates a different problem. For colour changes, see the fading-pattern guide.
Check temperature and pests
Look for contact with cold glass, draughts and recent transport. Also inspect leaf undersides for fine speckling, webbing or insects. Isolate the plant if pests are found and identify them before selecting a treatment labelled for indoor plants.
What improvement looks like
Look for stable leaves and healthy new growth, not a guaranteed recovery within hours. If curling progresses despite sensible moisture and shelter, take photographs of the whole plant, leaf undersides and pot to a plant specialist. Return to the care guide for the routine.
Reference material
Reference material consulted for this independently written guide. The publishers listed have not reviewed or endorsed it.
- RHS — Calathea growing guide
- University of Maryland — drought stress
- University of Maryland — root rots
- University of Maryland — symptom checks