45 days. Green Ice is one of the crispest, most satisfying loose-leaf lettuces you can grow. The leaves are glossy, dark green, and savoyed, giving them extra-crunchy texture in every bite. Ready in just 45 days, they are among the earliest, yet last well into summer, thanks to superior heat tolerance. This is one loose-leaf that just won't bolt! A distinctly different look and appeal, combining the large, ruffled look of a looseleaf with the crunchiness of a crisphead. Gardeners have enjoyed its bounty for years! Germination: Work and prepare soil bed while average daily highs are still in the lower 70's. Barely cover seeds with a thin layer of soil and water frequently until seedlings emerge, about 10 days. Thin to 4 inches apart. Lettuce thrives in cold weather and can be sown directly into the garden, starting in early spring. For an even earlier harvest, sow indoors; the seedlings don't mind transplanting. 600 seeds will sow a 30-foot row.