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Kale (keɪl), or leaf cabbage, belongs to a group of cabbage (Brassica oleracea) cultivars grown for their edible leaves, although some are used as ornamentals. Kale plants have green or purple leaves, and the central leaves do not form a head (as with headed cabbage). Kales are considered to be closer to wild cabbage than most of the many domesticated forms of Brassica oleracea. It is derived from wild mustard. Kale originates from Northern Middle English cale (compare Scots kail and German Kohl) for various cabbages. The ultimate origin is Latin caulis 'cabbage'. Kale originated in the eastern Mediterranean and Anatolia, where it was cultivated for food beginning by 2000 BCE at the latest. Curly-leaved varieties of cabbage already existed along with flat-leaved varieties in Greece in the 4th century BC. These forms, which were referred to by the Romans as Sabellian kale, are considered to be the ancestors of modern kales. The earliest record of cabbages in western Europe is of hard-heading cabbage in the 13th century. Records in 14th-century England distinguish between hard-heading cabbage and loose-leaf kale. Russian traders introduced Russian kale into Canada and then into the United States in the 19th century. USDA botanist David Fairchild is credited with introducing kale (and many other crops) to Americans, having brought it back from Croatia, although Fairchild himself disliked cabbages, including kale. At the time, kale was widely grown in Croatia mostly because it was easy to grow and inexpensive, and could desalinate soil. For most of the twentieth century, kale was primarily used in the United States for decorative purposes; it became more popular as an edible vegetable in the 1990s due to its nutritional value. During World War II, the cultivation of kale (and other vegetables) in the U.K. was encouraged by the Dig for Victory campaign. The vegetable was easy to grow and provided important nutrients missing from a diet because of rationing. Kale is usually an annual plant grown from seed with a wide range of germination temperatures.

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Kale

Collard (plant)

Collard is a group of certain loose-leafed cultivars of Brassica oleracea, the same species as many common vegetables including cabbage and broccoli. Collard is generally described as part of the Acephala (kale) cultivar group, but gets its own variety as Brassica oleracea var. viridis. The name "collard" comes from the word "colewort" (a medieval term for non-heading brassica crops). The plants are grown as a food crop for their large, dark-green, edible leaves, which are cooked and eaten as vegetables.

Spinach

Spinach (Spinacia oleracea) is a leafy green flowering plant native to central and Western Asia. It is of the order Caryophyllales, family Amaranthaceae, subfamily Chenopodioideae. Its leaves are a common edible vegetable consumed either fresh, or after storage using preservation techniques by canning, freezing, or dehydration. It may be eaten cooked or raw, and the taste differs considerably; the high oxalate content may be reduced by steaming. It is an annual plant (rarely biennial), growing as tall as .

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