Interveinal Yellowing? (Magnesium Deficiency)
Yellow between veins, veins stay green—classic Mg issue, often mid/old leaves.
Magnesium deficiency? Interveinal yellowing on older leaves—see causes and analyze fast.
Common Causes
- Low Mg in feed
- High Ca/K competition
- pH out of range
- RO water without Mg
How to Tell Which One You Have
Starts mid/lower leaves, yellow between veins, veins stay green.
FAQ
Add Cal-Mag?
Yes if RO/coco; keep EC reasonable.
Could it be iron?
Iron hits new growth first; Mg hits older.
Does pH cause this?
Yes, Mg locks out when pH off.