Lactuca sativa, Cold Resistant Butterhead - well known for its exceptional cold resistance, this very hardy butterhead type is for growing outside during the winter (but will benefit from cloche protection during particularly cold weather).. It boasts compact bright green heads ready in spring from an autumn sowing. 28 days baby (Cut & Come Again) or 55 days full size, Height: 15cm (6"). Spread: 30cm (12"). (You will get better growth if protected through winter), Seed Count Approx - 350 avg SOWING - Sow in an unheated greenhouse or protected area outside, from late summer making succession plantings every 1-2 weeks to ensure a constant harvest. Always harvest lettuce very early in the morning, Maturity 68 days Seed Depth: sow thinly and just lightly covered (5 to 10 days to emerge) Note: Lettuce will not germinate at high temperatures. (You will get better growth if protected through winter)