How to Start Seeds: Complete Guide from Seed to Garden

A comprehensive guide to growing vegetables and flowers from seed

Starting plants from seed lets you garden earlier in the season. With the right light and simple equipment, it's easy to grow from seed to harvest.

Keep It Simple

Begin with a few easy varieties like tomatoes, marigolds, basil, zinnia, coleus, nasturtium, or cosmos. Avoid fussy seeds like petunias until you gain experience.

Ensure Adequate Light

All seedlings need abundant light. A sunny south-facing window works, but grow lights with a timer (15 hours/day) guarantee consistent results.

Get the Timing Right

Check seed packets for "start indoors 6–8 weeks before last frost." Some vegetables (beans, squash) and flowers (poppies) are best direct-sown outdoors.

Six Steps from Seed to Garden

1. Choose containers: At least 2–3 inches deep with drainage. Seed-starting trays with built-in watering are ideal.
2. Prepare sterile mix: Use fresh seed-starting mix (not garden soil). Moisten until crumbly, not soggy.
3. Plant seeds: Follow packet depth. Plant 2 seeds per cell; snip weaker one if both germinate. Cover with plastic to retain moisture until germination.
4. Water, feed, repeat: Keep soil moist but not soggy. Use a fan for air circulation. Feed with liquid fertilizer after germination.
5. Provide intense light: 15 hours daily, lights just inches above seedlings. Raise as they grow.
6. Harden off: Gradually acclimate seedlings to outdoors over 7–10 days before transplanting.

Troubleshooting Common Issues

• Poor germination: Check temperature, moisture, seed viability.
• Leggy seedlings: Insufficient light—use grow lights, lower temperature, reduce fertilizer.
• Purple tomato leaves: Phosphorus deficiency—increase fertilizer strength.
• Damping-off: Use sterile mix and fan for air circulation.
• Surface mold: Too wet—reduce watering, increase air flow, scrape mold or repot.