Low Humidity? (High VPD Stress)
Dry air pulls moisture fast; leaves taco/canoe and edges crisp.
Low humidity stress? High VPD, taco leaves—see fixes and analyze fast.
Common Causes
- RH too low for stage
- High temps with strong airflow
- Intense light raising leaf temp
How to Tell Which One You Have
Tacoing/canoeing plus dry edges; VPD chart shows high; runoff EC normal.
FAQ
Fix?
Raise RH or lower temp/light to hit VPD target.
Mist leaves?
Better to fix environment; avoid wetting buds.
Add humidifier?
Yes, or reduce exhaust until RH recovers.