Curling Leaves
Leaves curl inward, downward, or crisp at the edges as a defensive response to stress — the direction and texture of the curl narrow down the cause.
Common causes
Underwatering
Curling paired with dry, lightweight soil means the plant is conserving water by reducing its exposed leaf surface. Water thoroughly and keep to a more consistent schedule.
Heat or direct sun stress
Leaves curl and feel warm to the touch when scorched by intense light or heat. Move the plant back from the window or add a sheer curtain.
Low humidity
Thin-leafed tropicals like calathea and ferns curl in dry air even with adequate watering. Raise humidity with a pebble tray, grouping, or a humidifier.
Pest feeding damage
Aphids and thrips distort new growth as they feed, causing a puckered curl. Check the undersides of young leaves and treat accordingly.