Great Lakes Lettuce produces a large crisp iceberg type head of lettuce. It has an excellent flavour, making this a perfect selection for salads and sandwiches. It has large to medium green cabbage-like heads with light green centers. Leaves are shiny and lightly crumpled. It is very adaptable, heat tolerant, very hardy and resistant to scald and tip burn.
Direct sow lettuce seeds in early spring or late summer, depending on your climate. Choose a location that receives partial shade in hotter climates and full sun in cooler climates. Sow seeds 1cm (½”) deep, spaced 2.5-5cm (1-2”) apart in rows spaced 30-45cm (12-18”) apart. To promote germination, keep the soil consistently moist and cool. The seeds should sprout in 7-14 days. Thin seedlings to 15-25cm (6-10”) apart when they are 5-7cm (2-3”) tall.
Lettuce prefers well-drained soil that is rich in organic matter. The soil pH should be between 6.0 and 7.0. Fertilize with a balanced fertilizer every 4-6 weeks during the growing season. Harvest lettuce leaves when they are young and tender. Cut the entire plant or pick individual leaves as needed. Lettuce is a cool-season crop and can bolt (go to seed) in hot weather. Providing shade or planting in a cooler location can help extend the growing season. Soil Conditions: Well-drained soil that is rich in organic matter. Soil pH: 6.0-7.0 Planting Depth: Sow seeds 1cm (½”) deep. Germination: 7-14 days. Height at Maturity: 15-25cm (6-10”) tall. Days to Maturity: 40-60 days. Watering: Keep soil consistently moist and cool. Lettuce prefers consistent watering throughout the season. Sun/Shade: Partial shade in hot climates, full sun in cooler climates. Spacing after Thinning: Thin seedlings to 15-25cm (6-10”) apart.