Nitrogen Deficiency? (Yellowing Bottom Leaves)
Lower leaves yellowing first? Classic low-N sign, but pH or overwatering can mimic it.
Nitrogen deficiency in cannabis? Yellow bottom leaves—see causes and analyze fast.
Common Causes
- Low N in feed late veg
- Too much plain water flushing N
- pH off causing lockout
- Overwatering slowing uptake
How to Tell Which One You Have
Starts at bottom, moves up; veins pale too. Tops stay greener until severe.
FAQ
Can overwatering look like N deficiency?
Yes, poor uptake mimics low N.
Fix by heavy feeding?
Restore balanced N, don't spike EC.
Safe in late flower?
Mild fade is normal; severe yellow is not.