Fan leaves yellowing late in flower while buds keep ripening
Slow, from the bottom and fan leaves first, in the last 2-3 weeks of flower; buds stay healthy and swelling..
- Also called
- fade
- autumn colours
- leaves yellowing near harvest
- fan leaves dying week 7
- senescence
Likely causes, most likely first
Ranked for this sign on its own. Your stage, medium and readings change the order, so run the checker for your plant.
LikelyNormal late-flower fade (senescence)
Fix: Nothing to fix in the last 2-3 weeks of flower. Keep feeding at stage strength with N tapered; don't 'flush' (pre-harvest flushing starves the plant while it packs on final weight and resin, and controlled studies show no quality gain). Fade before week 5-6 of flower suggests N was cut too early.
Recovery: Buds keep swelling and ripening normally while fan leaves fade.
How to confirm it
- Measure runoff EC against input EC. Water to 10-20% runoff, collect the runoff in a clean cup and measure EC of both with a calibrated meter (1.413 mS/cm standard). Runoff more than ~0.5 mS/cm above input means salt build-up; well below input means the plant is hungry or you are over-leaching. In hydro, compare reservoir EC with the EC you mixed.
Look for
Yellow, orange or purple fan leaves in late flower with healthy, frosty buds and pistils mostly receded..
The full guide: Yellowing lower leaves on cannabis: a differential
Guidance, not a guarantee. The checker weighs common causes against what you tell it; confirm with the tests before you treat, change one thing at a time and watch the new growth.
