Basil Seedling Leaf Crinkling: Light, Heat, Airflow, Fertilizer

Mature basil leaves crinkling/tan in greenhouse: likely cultural, not disease.

Requirements Checklist

• Light: 16h (supplemental if needed).
• Heat: 70°F+ bottom heat until nights 70°F+.
• Airflow: Fan constant. Prevents fungal issues.
• Water: Light weekly. No soggy.
• Feed: Fish fertilizer every 3 weeks (Home Depot/Lowe's).

Action

1. Remove diseased leaves.
2. Verify all 5 factors above.
3. Adjust immediately.

Greenhouse basil needs same intensity as outdoor summer. Supplemental light/heat often required in spring.