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Kale

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Kale, also known as leaf cabbage, is a diverse group of plants belonging to the species *Brassica oleracea*. These cultivars are primarily grown for their edible leaves, though many are used as ornamental plants. Unlike headed cabbage, the central leaves of a kale plant do not form a tight head. The leaves can appear bumpy, curly, or flat, with colors ranging from light green to violet-brown.

Kids harvesting kale
Kids harvesting kale

The stems of the plant may be white or red, and they can remain tough even after cooking.

Cultivating kale involves managing a hardy biennial plant grown from seeds. Because it is derived from wild mustard, kale is biologically closer to wild cabbage than most other domesticated *B. oleracea* forms. It thrives in wintertime and can survive very low temperatures. Interestingly, a heavy frost can actually make the leaves taste sweeter. One specific variety, known as rape kale, is called "hungry gap" kale. This name refers to the traditional agricultural period in winter when few other crops can be harvested.

There are many distinct types of kale classified by leaf shape and stem length. Curly-leaf varieties include Scots kale and blue curled kale. Bumpy-leaf types, such as Tuscan kale or dinosaur kale, are also known as *cavolo nero* in Italian. Some varieties feature sparkly or glossy leaves, while others are plain-leaf types like red Russian kale. There is even a feathery-type leaf that is a cross between curly and plain varieties.

Ornamental Kale
Ornamental Kale

Additionally, ornamental kale varieties like peacock kale or chidori kale are grown for their brilliant white, pink, or lavender colors.

The history of kale stretches back thousands of years to the eastern Mediterranean and Anatolia. Evidence shows it was cultivated for food by 2000 BCE at the latest. By the 4th century BC, Greece grew both curly and flat-leaved varieties. The Romans referred to these ancestors of modern kale as Sabellian kale. In 14th-century England, records began to distinguish between loose-leaf kale and hard-heading cabbage. Later, in the 19th century, Russian traders introduced Russian kale to Canada and the United States.

20231109 ornamental kale Rady Europy Square Katowice 02
20231109 ornamental kale Rady Europy Square Katowice 02

USDA botanist David Fairchild is credited with bringing kale to Americans from Croatia.

In the United States, kale has seen a massive shift in significance. For most of the 20th century, it was used mainly for decoration. However, it became a common food starting in the 1990s due to its high nutritional value. Today, it is one of the most popular greens in the country, frequently found in salads and smoothies. In 2012, the scale of its use was highlighted when Pizza Hut purchased approximately 14,000 lbs of kale for salad bar decoration. It is also used as a decorative ingredient in vegetable and wedding bouquets.

Nutritionally, raw kale is composed of 84% water, 9% carbohydrates, 4% protein, and 1% fat. It is an exceptionally rich source of vitamin K, providing 3.7 times the Daily Value in a single serving. It also provides 20% or more of the Daily Value for vitamins A, C, folate, and manganese. Kale is a good source of several minerals, including calcium, magnesium, and potassium.

Ornamental Kale
Ornamental Kale

While boiling raw kale diminishes many of these nutrients, steaming, microwing, or stir-frying does not cause a significant loss of glucosinolate compounds. These compounds are part of the plant's phytochemical profile, which includes carotenoids like lutein and zeaxanthin.

Culturally, kale is a staple in many different global traditions. In the Netherlands, people eat *boerenkoolstamppot*, a mix of curly kale and mashed potatoes. In Northern Germany, the tradition of *Kohlfahrt*, or a "kale trip," involves hiking before eating kale with sausage. In Ireland, kale is mixed with potatoes to create the traditional dish colcannon. In Italy, the bumpy *cavolo nero* is used in Tuscan *ribollita* soup.

Kids harvesting kale
Kids harvesting kale

Even the name of a famous group of Scottish writers, the Kailyard school, comes from the word for a kale field.

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Ornamental Kale.jpg
File:20231109 ornamental kale Rady Europy Square Katowice 02.jpg
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