LETTUCE SEEDS

When to Sow Outside: RECOMMENDED. 2 to 4 weeks before your average last frost date, and when soil temperature is at least 40°F, ideally 60°–70°F. Successive Sowings: Every 3 weeks until 4 to 6 weeks before your average first fall frost date. Mild Climates: Sow in fall and winter for cool season harvests. When to Start Inside: 4 to 6 weeks before your average last frost date, and in summer when soil temperatures are too warm (above 80°F) to germinate lettuce seed. Days to Emerge: 5–10 days Seed Depth: Surface to 1/8" Seed Spacing: A group of 3 seeds every 6"–8" Row Spacing: 8" Thinning: When 1/2" tall, thin to 1 every 6"–8"