Curling Leaves Upward? (Leaf Cupping)
Leaves curling up at edges (cupping/canoeing/tacoing) indicates heat stress, light stress, or VPD issues.
Curling leaves upward? Leaf cupping—see causes and analyze fast.
Common Causes
- Heat stress (too hot)
- Light too intense or close
- High VPD (low humidity + heat)
- Wind stress
- Overwatering
How to Tell Which One You Have
Leaf edges curl upward forming cup/canoe shape. Affects top leaves first if heat/light issue.
FAQ
Vs down curl?
Up curl = heat/light stress. Down curl = overwatering or nitrogen toxicity.
Fix?
Lower temps, raise lights, increase humidity, improve airflow, check watering.
Recover?
Yes, affected leaves stay curled but new growth will be normal once fixed.