lettuce is a garden plant used for centuries in food. - has has great variation with respect to the shape, size, color, texture, etc. - it is widely used in cooking to prepare salads. - has harvest period from may to november, a time which can be found abundantly. - by having very few calories (15 calories per 100 grams), this vegetable can be consumed at will. - its various types are easily found in super markets, fairs, grocery stores, etc. - among its types are: curly lettuce, roman, mimosa, american, cabbage lettuce, etc. - has the following vitamins: a, c and niacin. - it is rich in minerals such as calcium, phosphorus and iron.