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Read the leaf.
27 common problems — deficiency, toxicity, pest, disease, and stress. Spot the signature, confirm the cause, apply the fix. Start with where on the plant it shows: older leaves point to mobile nutrients, new growth to immobile ones.
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deficiencyLow
Nitrogen (N) deficiency
What you see
Uniform pale-green fading to whole-leaf yellow with NO interveinal pattern; overall pale plant. Older leaves droop, dry, and pluck easily (limp, not firm).
Where on the plant
Lower/oldest leaves first, progressing upward
Mobility
mobile
Confirm it
New growth still green while lower leaves yellow uniformly; runoff/feed EC reads low. Limp texture distinguishes from light burn (firm) and overwatering (firm, downward).
The fix
Go deeper — Dept 8: IPM & Diagnostics - 1Confirm pH is in range: 5.8-6.2 coco / 5.5-6.0 rockwool before dosing
- 2Raise N in the base feed toward the vegetative target (feed EC ~1.4-2.0 mS/cm veg)
- 3Note that N is deliberately tapered in late flower - mild lower-leaf fade in ripening is normal, not a deficiency
- 4Recheck new-growth color within 3-5 days