• Lettuce is always eaten fresh. Because of its high water content (95%), it cannot be frozen or canned • Lettuce was also very important to the ancient Romans and ancient Greeks who believed that lettuce induced sleeping. • Italian explorer, Christopher Columbus, introduced the lettuce to America during his second voyage to the New World in 1494. • Lettuce is a leafy vegetable that belongs to the sunflower family. • Lettuce prefers colder climate, which postpones development of flowers and ensures proper development of leaves.