WikiPepper Editorial
Quick Reference
- Which leaves is the diagnostic question: old leaves yellowing points at nitrogen or magnesium; new leaves point at iron or sulfur.
- Yellowing plus constantly wet soil and gnats is overwatering, not a deficiency.
- Several deficiencies at once usually means a pH problem locking out nutrients, correct toward about 6.8 before adding anything.
Yellow leaves are the most over-treated symptom in pepper growing. Before reaching for a supplement, read which leaves are yellowing, and how.
Symptom map
| What you see | Likely cause | Fix |
|---|---|---|
| Older leaves yellow first | Nitrogen deficiency | Balanced fertilizer with nitrogen |
| Yellow between veins, older leaves | Magnesium deficiency | Epsom salt, 1 tbsp per gallon |
| New leaves pale or chlorotic | Iron deficiency | Iron chelate; acidify soil slightly |
| New leaves yellowing overall | Sulfur deficiency | Sulfur-containing fertilizer |
| Yellowing + wet soil + gnats | Overwatering / root rot | Let soil dry; improve drainage |
| Mixed, contradictory symptoms | pH lockout | Adjust pH toward ~6.8 |
| One-sided yellowing and wilt | Fusarium wilt | Remove plant; rotate crops |
The cases that aren’t problems
Some yellowing and leaf drop right after transplanting or shipping is a normal adjustment period, not a deficiency. Slow, pale early growth is also normal for chinense and baccatum seedlings, they start slow and catch up.
Grower’s Takeaway
- Old leaves = mobile nutrients (N, Mg). New leaves = immobile (Fe, S).
- Rule out overwatering before buying supplements.
- Fix pH before chasing individual deficiencies.
- Post-transplant yellowing usually heals itself.
Sources & Further Reading
- Priest, C.T. & Austin, D.J. The Chile Pepper Almanac. Amazon.
- Drawn from the WikiPepper reference library; related coverage at WikiPepper.org on plant diagnosis, nutrient lockout, and watering.
