Symptoms
- check_circleLeaf edges curling under (inward toward the stem)
- check_circleLeaf edges curling upward or cupping
- check_circleOverall cupping of leaves from the centre
- check_circleCurling accompanied by discolouration
Causes
- arrow_rightUnderwatering — curling to reduce transpiration surface area
- arrow_rightHeat stress — same mechanism as drought response
- arrow_rightOverwatering / root rot — damaged roots can't deliver water
- arrow_rightLow humidity — moisture lost from leaf surface
- arrow_rightPests (thrips, spider mites) feeding on leaves
- arrow_rightVirus infection — causes distorted, curling new growth
- arrow_rightCold temperatures or draughts
How to Diagnose
Check the soil moisture first. Dry soil + curling = underwatering. Wet soil + curling = possible root rot. If new growth is curling and distorted in an irregular way, look for thrips or check for virus. Consistent inward curling on moisture-loving plants usually points to low humidity.
Treatment
Underwatering: water thoroughly. Root rot: unpot, trim roots, repot. Low humidity: increase humidity with a humidifier. Pests: treat with neem oil or insecticidal soap. Virus: remove infected plants as there's no cure — avoid spreading to others.
Prevention
Maintain consistent watering and humidity. Keep plants away from heating vents and cold draughts. Inspect regularly for pests. Avoid overfeeding, which can make plants more susceptible to pests.
Affected Plants
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