How to Grow Lettuce Indoors Year-Round

Fresh, homegrown lettuce in January? Absolutely. With a small space, basic supplies, and a grow light, you can harvest salad greens continuously—no garden required.

What You'll Need

• Cool, undisturbed spot (basement, spare room, kitchen corner)
• Loose-leaf lettuce seeds (Black Seeded Simpson, Buttercrunch, Bibb)
• Shallow containers (6-inch pots, recycled milk jugs, window boxes)
• Potting soil (not garden soil—avoids pests)
• Full-spectrum grow light (shop light fixture + bulb, ~$20)
• Water

Step-by-Step

1. Choose the Right Variety

Loose-leaf types let you harvest outer leaves while the center keeps producing—unlike head lettuce, which is one-and-done.

2. Set Up Containers

Lettuce has shallow roots. A 6-inch pot works; so does a halved milk jug. For continuous harvest, start 2-3 containers at 2-week intervals. Lettuce matures in ~4 weeks.

3. Use Quality Potting Mix

Pre-fertilized potting soil is ideal. Reuse it 2-3 times by mixing in slow-release fertilizer, though fresh soil each cycle is safest.

4. Provide 12-18 Hours of Light

A single-bulb shop light or fluorescent grow light hung on chains works perfectly. Keep it a few inches above plants, raising as they grow.

5. Water Consistently

Daily light watering or every-other-day deeper watering both work. Check drainage—no standing water in trays.

Pro Tips

• Lettuce prefers cool temps (60-65°F). Avoid hot attics or near heat vents.
• Harvest outer leaves first; the plant keeps growing.
• Stagger plantings for non-stop salads.

Minimal effort, maximum freshness. Start this weekend and eat homegrown greens all winter.