Botanical Name: Lactuca sativa
Days to Maturity: 28–50 days
Native: Unknown; lettuce has been in cultivation for a long time.
Hardiness: Frost-tolerant annual
Plant Dimensions: 4"–6" wide, 12"–16" tall
Variety Information: Tightly formed, crisp, romaine-type lettuce.
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"
Harvesting: Harvest in the morning, by cutting off at ground level. If regrowth is desired, cut the leaves higher, at 2". For a continual supply, outer, individual leaves can be harvested at any stage of maturity, but leave at least half of the plant for regrowth.