Lettuce DescriptionBotanical Name: Lactuca Is a fairly hardy, cool-weather vegetable that thrives when the average daily temperature is between 60 and 70 degrees.Some types and varieties of lettuce withstand heat better than others. Lettuce, except iceberg, is also a moderately good source of vitamin C, calcium, iron and copper. Plant CharacteristicsPlant Category: Herbs & VegetablesName: LettucePlant Type: VegetableMature Size: 12"Water: ModerateExposure:: Full sunSpacing: 8"Soil Type: Clay; loam; sand; acidic; slightly alkaline; well drained Planting Time: Spring of Fall