Lettuce thrives in the cool spring season so it requires planting in early spring once soil temperatures are above 60 degrees Fahrenheit. Lettuce, botanically classified as Lactuca sativa, is the name given to dozens of cultivars of lettuce, all of which are adapted to specific planting regions and periods and belong to the Asteraceae family. Iceberg lettuce is one of the only lettuce varieties that does not occur in red form as well as green.
Broccoli is a fast-growing annual plant that grows 60–90 centimeters (24–35 inches) tall. Upright and branching with leathery leaves, broccoli bears dense green clusters of flower buds at the ends of the central axis and the branches. It is an excellent source of vitamin K, vitamin C, chromium, and folate. Broccoli is a very good source of dietary fiber, pantothenic acid, vitamin B6, vitamin E, manganese, phosphorus, choline, vitamin B1, vitamin A (in the form of carotenoids), potassium, and copper.