A lettuce variety that does well in a backyard vegetable garden is called salad bowl lettuce. It develops into enormous rosettes of lime green, fragile, and delicate leaves. This kind has a strong heat tolerance and doesn't get bitter in warmer climates. The small leaves mature in about 28 days, and it takes them about 50 days to reach their full size. Salad Bowl Lettuce Seeds grow well in chilly climates. Salad Bowl Lettuce Seeds Attributes: package of seeds 1000 seeds in size. 28 to 50 days until maturity. 1 gramme in weight.