Black Streaks on Jalapeños: Chemical Burn or Disease?

Black patches on pepper sides (not stems) often indicate fertilizer burn—especially from synthetic feeds like Miracle-Gro applied too strong or too often.

Action Plan

• Stop fertilizing; water only for 2–3 weeks.
• Flush soil with heavy watering (container) or deep soak (ground).
• New growth should be clean.

Edibility

Cut away blackened areas. If flesh underneath is firm and smells normal, it's safe. Don't can affected fruit.

Prevention

Use half-strength organic fertilizer (fish emulsion, kelp) every 3–4 weeks. Avoid foliar feeding in hot sun.