Preventing Damping-Off in Indoor Squash Seedlings

Squash seedlings that wilt, develop white stems, and collapse at the soil line are victims of damping-off—a fungal disease caused by contaminated soil, poor air circulation, or overwatering.

Immediate Fixes

• Use sterile, soilless seed-starting mix (peat, vermiculite, perlite).
• Ensure pots have drainage holes; never let pots sit in water.
• Remove humidity domes at first germination.
• Run a low fan 3+ feet away to keep air moving.
• Water only when the top inch of mix feels dry.

Light and Feeding

Provide 14 hours of strong light daily (fluorescent tubes 3–4" above plants). After true leaves appear, feed weekly with half-strength fish/seaweed emulsion.

Prevention Checklist

1. Sterilize reused containers with 1 tsp bleach per gallon water.
2. Start seeds in individual cells to avoid root disturbance.
3. Harden off before transplanting outdoors.

Following these steps will give your squash a vigorous, disease-free start.