Green Ice Lettuce needs full sun, moist but well-drained soil to mature in 45 days. It has a sweet flavor and heat resistance. Seeds are used for reproduction as pollen falls on the stigma and fertilizes the egg to form seeds. While its origins are uncertain, it was modified from a toxic plant by possibly Egyptians. It provides food for animals in the ecosystem and the author chose to research lettuce so they could grow it for salads.