Overwintering Jalapeño Plants in Missouri: Indoor Care Guide

Challenges of Overwintering

Peppers are perennials in tropics but grown as annuals in temperate zones. Overwintering in Missouri (Zone 5–6) is difficult: low light, dry air, and pests (aphids, spider mites) indoors often cause decline.

Two Strategies

Option 1: Keep as Houseplant (Low Success)

• Bright south window + supplemental grow light (12+ hours).
• Cool temps (60–65°F) to slow growth.
• Water sparingly; mist for humidity.
• Watch for pests—treat with neem/insecticidal soap.
• Expect leaf drop; may not fruit well.

Option 2: Start Fresh from Seed (Recommended)

• Sow seeds indoors late January–February.
• Use heat mat (80°F) for germination.
• Grow under lights until last frost (late April).
• Healthier, more productive plants.

If You Try Overwintering

Prune back by 1/2, repot in fresh mix, keep barely moist. Don't fertilize until new growth appears in spring. Greenhouses help but increase pest pressure.