Curling leaves are one of the most common signs that a houseplant is under stress. There are several reasons why this can happen, and identifying the cause is the first step toward correcting it. One frequent cause is underwatering. When a plant does not get enough water, it curls its leaves to conserve moisture, often accompanied by dry or crispy edges. Conversely, overwatering can also lead to curling leaves, as excess water suffocates roots and causes the plant to struggle.
Low humidity is another culprit, particularly in UK homes during winter when central heating dries the air. Tropical plants like Calatheas, monsteras, or ferns are especially sensitive and may curl their leaves to protect themselves. Temperature extremes or draughts can also cause curling, as sudden cold or hot air stresses the plant. Pests, such as spider mites or aphids, can damage foliage and lead to curling as well.
To help your plant recover, first check soil moisture and adjust watering. Increase humidity using a humidifier, pebble tray, or regular misting for tropical species. Inspect leaves for pests and treat them if needed. Move plants away from draughty windows or heaters. With consistent care and attention, curling leaves usually return to normal over time, and your houseplant will continue to thrive.