Yellow New Growth? (Sulfur Deficiency)
Top growth turns pale uniformly; unlike iron, entire new leaves yellow.
Sulfur deficiency cannabis? Yellow new growth—see causes and analyze fast.
Common Causes
- Low S in feed/RO
- Heavy filtering removing S
- High pH reducing S availability
How to Tell Which One You Have
New leaves evenly light yellow; veins also pale; lower leaves stay greener.
FAQ
Add Epsom?
MgSO4 adds Mg and S; use modestly.
pH fix?
Keep 6.0–6.5 soil, 5.8–6.1 coco.
Confused with iron?
Iron yellows between veins; sulfur yellows uniformly.