|Species||Allium ampeloprasum L.|
|Cultivar group||Leek Group (other names are used, e.g. Porrum Group)|
|Cultivar||Many, see text|
|Nutritional value per 100 g (3.5 oz)|
|Energy||255 kJ (61 kcal)|
|- Sugars||3.9 g|
|- Dietary fiber||1.8 g|
|Vitamin A equiv.||83 μg (10%)|
|- beta-carotene||1000 μg (9%)|
|- lutein and zeaxanthin||1900 μg|
|Thiamine (vit. B1)||0.06 mg (5%)|
|Riboflavin (vit. B2)||0.03 mg (3%)|
|Niacin (vit. B3)||0.4 mg (3%)|
|Pantothenic acid (B5)||0.14 mg (3%)|
|Vitamin B6||0.233 mg (18%)|
|Folate (vit. B9)||64 μg (16%)|
|Vitamin C||12 mg (14%)|
|Vitamin E||0.92 mg (6%)|
|Vitamin K||47 μg (45%)|
|Calcium||59 mg (6%)|
|Iron||2.1 mg (16%)|
|Magnesium||28 mg (8%)|
|Manganese||0.481 mg (23%)|
|Phosphorus||35 mg (5%)|
|Potassium||180 mg (4%)|
|Link to USDA Database entry
Percentages are relative to
US recommendations for adults.
Source: USDA Nutrient Database
The leek is a vegetable that belongs, along with onion and garlic, to the genus Allium, currently placed in family Amaryllidaceae, subfamily Allioideae. Historically many scientific names were used for leeks, which are now treated as cultivars of Allium ampeloprasum. Two related vegetables, elephant garlic and kurrat, are also cultivars of A. ampeloprasum, although different in their uses as food.
The edible part of the leek plant is a bundle of leaf sheaths that is sometimes erroneously called a stem or stalk.
Rather than forming a tight bulb like the onion, the leek produces a long cylinder of bundled leaf sheaths that are generally blanched by pushing soil around them (trenching). They are often sold as small seedlings in flats that are started off early in greenhouses, to be planted out as weather permits. Once established in the garden, leeks are hardy; many varieties can be left in the ground during the winter to be harvested as needed.
Leek cultivars may be treated as a single cultivar group, e.g. as Allium ampeloprasum 'Leek Group'. The cultivars can be subdivided in several ways, but the most common types are "summer leeks", intended for harvest in the season when planted, and overwintering leeks, meant to be harvested in the spring of the year following planting. Summer leek types are generally smaller than overwintering types; overwintering types are generally more strongly flavoured. Cultivars include 'King Richard' and 'Tadorna Blue'.
Leeks are easy to grow from seed and tolerate standing in the field for an extended harvest. Leeks usually reach maturity in the autumn months, and they have few pest or disease problems. Leeks can be bunched and harvested early when they are about the size of a finger or pencil, or they can be thinned and allowed to grow to a much larger mature size. Hilling leeks can produce better specimens.
Leeks have a mild onion-like taste. In its raw state, the vegetable is crunchy and firm. The edible portions of the leek are the white base of the leaves (above the roots and stem base), the light green parts, and to a lesser extent the dark green parts of the leaves. One of the most popular uses is for adding flavor to stock. The dark green portion is usually discarded because it has a tough texture, but it can be sauteed or added to stock. A few leaves are sometimes tied with twine and other herbs to form a bouquet garni.
Leeks are typically chopped into slices 5–10 mm thick. The slices have a tendency to fall apart, due to the layered structure of the leek. The different ways of preparing the vegetable are:
- Boiled, which turns it soft and mild in taste. (Care should be taken to chop the vegetable, or else the intact fibers that run the length of the vegetable will tangle into a ball while chewing.)
- Fried, which leaves it crunchier and preserves the taste.
- Raw, which can be used in salads, doing especially well when they are the prime ingredient.
- In Turkish cuisine, leeks are chopped into thick slices, then boiled and separated into leaves and finally filled with a filling usually containing rice, herbs (generally parsley and dill), onion and black pepper. For sarma with olive oil  currants, pine nuts and cinnamon are added and for sarma with meat, minced meat is added to the filling. In Turkey, especially "Zeytinyağlı pırasa" (leek with olive oil), "Ekşili pırasa (sour leek), "Etli pırasa" (leek with meat), "Pırasa Musakka"(leek musakka), "Pırasalı börek (börek with leek) and "Pırasa köftesi" leek meatball are also cooked.
Because of their symbolism in Wales (see below), they have come to be used extensively in that country’s cuisine. Elsewhere in Britain, leeks have come back into favour only in the last 50 years or so, having been overlooked for several centuries.
Historical consumption 
Dried specimens from archaeological sites in ancient Egypt, as well as wall carvings and drawings, led Zohary and Hopf to conclude the leek was a part of the Egyptian diet from at least the second millennium BCE onwards. They also allude to surviving texts that show it had been also grown in Mesopotamia from the beginning of the second millennium BCE. The leek was the favourite vegetable of the Emperor Nero, who consumed it in soup or in oil, believing it beneficial to the quality of his voice.
Cultural significance 
The leek is one of the national emblems of Wales, worn along with the daffodil (in Welsh, the daffodil is known as "Peter's leek," Cenhinen Bedr) on St. David’s Day. According to one legend, King Cadwaladr of Gwynedd ordered his soldiers to identify themselves by wearing the vegetable on their helmets in an ancient battle against the Saxons that took place in a leek field. This story may have been made up by the English poet Michael Drayton, but the leek has been known to be a symbol of Wales for a long time; Shakespeare, for example, refers to the custom of wearing a leek as an “ancient tradition” in Henry V. In the play, Henry tells Fluellen that he is wearing a leek “for I am Welsh, you know, good countryman.” The 1985 and 1990 British one pound coins bear the design of a leek in a coronet, representing Wales.
Alongside the other national floral emblems of countries in the Commonwealth (including the English Tudor Rose, Scottish thistle, Irish shamrock, Canadian maple leaf, and Indian lotus), the Welsh leek appeared on the coronation gown of Elizabeth II. It was designed by Norman Hartnell; when Hartnell asked if he could exchange the leek for the more aesthetically pleasing Welsh daffodil, he was told no.
In Romania, the leek is also widely considered a symbol of Oltenia, a historical region in the southwestern part of the country.
See also 
- Allium tricoccum, a North American plant commonly known as "wild leek"
- Culture of Wales
- Kurrat, Egyptian Leek
- Laukaz, a rune that has been speculated to mean “leek”
- List of vegetables
- Loituma Girl, also known as "Leekspin"
- Welsh onion
- Stevens, P.F. (2001 onwards), Angiosperm Phylogeny Website: Asparagales: Allioideae
- "Allium ampeloprasum", World Checklist of Selected Plant Families, Royal Botanic Gardens, Kew, retrieved 2013-02-01
- Brewster, James L. (2008). Onions and other vegetable alliums (2nd ed.). Wallingford, UK: CABI International. ISBN 978-1-84593-399-9. p. 30
- Librarie Larousse, ed. (1984). Larousse Gastronomique: The World's Greatest Cooking Encyclopedia. The Hamlyn Publishing Group Limited.
- http://www.takvim.com.tr/Yemek/Diger/2013/01/02/zeytinyagli-pirasa-sarmasi Leek sarma with olive oil recipe
- http://www.turkish-media.com/yemektarifleri/viewrecipe.php?id=859&ord=id&asc=DESC Leek sarma with meat recipe
- Jane Grigson, Jane Grigson's Vegetable Book, (Penguin Books, 1978, ISBN 0-14-046859-5) p 291
- Daniel Zohary and Maria Hopf, Domestication of plants in the Old World, third edition (Oxford: Oxford University Press, 2000), p. 195.
- Pliny, Historia Naturalis, XIX, 33.
- Rosemary Goulding (June 1998). "SILVER AND GOLD". Waterlooville Parish Church. Retrieved 8 February 2013.
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