← All symptoms
Curling leaves
Direction of the curl (up vs. down) is the fastest way to narrow this down.
Causes, how to tell, and fixes
- 1
Heat stress
leaves curl upward, 'taco-ing'
How to tell
Happens under intense light or high ambient temperature, often with the plant closest to the light affected most
Fix
Raise the light or check ambient temperature — aim for roughly 70–85°F in the grow space
- 2
Overwatering
leaves curl downward, look full/heavy
How to tell
Paired with dark green color and droopy, almost overfilled-looking leaves
Fix
Ease off watering frequency and check drainage
- 3
Nutrient burn or overfeeding
How to tell
Downward claw-like curling combined with dark green leaves and sometimes tip burn
Fix
Reduce feeding strength and flush with plain water