White Tops? (Light Bleaching)
Excess PPFD/UV bleaches top leaves/buds; chlorophyll drains out.
Light bleaching cannabis? White tops—lower intensity and analyze fast.
Common Causes
- Lights too close
- PPFD beyond stage target
- High UV exposure
- Hot canopy
How to Tell Which One You Have
Pale/white tops only at canopy; lower leaves normal; often with crisp tips.
FAQ
Fix?
Raise/lower intensity; cool canopy.
Permanent?
Bleached tissue stays pale; new growth recovers.
Add nutrients?
Main fix is reducing light, not feed.