Cardoon

Cardoon
Plants in bloom, Sudoeste Alentejano e Costa Vicentina Natural Park, Portugal
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Cynara
Species:	C. cardunculus
Binomial name
Cynara cardunculus L.
Synonyms[1]
Carduus cardunculus (L.) Baill. Carduus cynara E.H.L.Krause Carduus scolymus Baill. Cnicus communis Lam. Cynara communis Lam. Cynara corsica Viv. Cynara esculenta Salisb. Cynara ferox Ten. ex Steud. Cynara horrida Aiton Cynara hortensis Mill. Cynara spinosissima J.Presl & C.Presl Cynara sylvestris Lam.

The cardoon (Cynara cardunculus), also called the artichoke thistle, cardone, cardoni, carduni or cardi, is a thistle-like plant in the family Asteraceae. It is a naturally occurring species that is sometimes considered to include the globe artichoke, and has many cultivated forms. It is native to the western and central Mediterranean region, where it was domesticated in ancient times.

Description

The wild cardoon is a stout herbaceous perennial plant growing 0.8 to 1.5 m (31 to 59 in) tall, with deeply lobed and heavily spined green to grey-green tomentose (hairy or downy) leaves up to 50 cm (20 in) long, with yellow spines up to 3.5 cm long. The flowers are violet-purple, produced in a large, globose, massively spined capitulum up to 6 cm (2 in) in diameter.^[2][3][4][5]

It is adapted to dry climates, native across an area from Morocco and Portugal east to Libya and Greece and north to France and Croatia; it may also be native on Cyprus, the Canary Islands and Madeira.^[6] In France, it only occurs wild in the Mediterranean south (Gard, Hérault, Aude, Pyrénées-Orientales, Corsica).^[4] It has become an invasive weed in the pampas of Argentina,^[5] and is also considered a weed in Australia and California.

In cultivation in the United Kingdom, this plant has gained the Royal Horticultural Society's Award of Garden Merit.^[7]

Cultivation

Cultivated cardoon foliage, Madrid Royal Botanical Garden, without leaf spines.

The two main cultivar groups are the cardoon (Cynara cardunculus Cardoon Group, syn. C. cardunculus var. altilis DC), selected for edible leaf stems, and the artichoke (Cynara cardunculus Scolymus Group, sometimes distinguished as Cynara scolymus or C. cardunculus var. scolymus (L.) Fiori), selected for larger edible flower buds. They differ from the wild plant in being larger (up to 2 m tall), much less spiny, and with thicker leaf stems and larger flowers, all characteristics selected by humans for greater crop yield and easier harvest and processing.^[2][8] Wild and cultivated cardoons and artichokes are very similar genetically, and are fully interfertile, but only have very limited ability to form hybrids with other species in the genus Cynara.^[2]

The earliest description of the cardoon may come from the fourth-century BC Greek writer Theophrastus, under the name κάκτος (Latin: cactus), although the exact identity of this plant is uncertain.^[2] The cardoon was popular in Greek, Roman, and Persian cuisine, and remained popular in medieval and early modern Europe. It also became common in the vegetable gardens of colonial America. They fell from fashion only in the late 19th century. In Europe, cardoon is still cultivated in France (Provence, Savoie, Lyonnais), Spain, and Italy. In the Geneva region, where Huguenot refugees introduced it about 1685, the local cultivar 'Argenté de Genève' ('Cardy')^[9] is considered a culinary specialty. "Before cardoons are sent to table, the stalks or ribs are blanched tying them together and wrapping them round with straw, which is also tied up with cord, and left so for about three weeks".^[10] Cardoons also are common vegetables in northern Africa, often used in Algerian or Tunisian couscous.

Cardoon stalks can be covered with small, nearly invisible spines that can cause substantial pain if they become lodged in the skin. Several spineless cultivars have been developed to overcome this.

Cardoon requires a long, cool growing season (about five months), but it is frost-sensitive. It also typically requires substantial growing space per plant, so is not much grown except where it is regionally popular.

Gastronomy

While the flower buds can be eaten much as small (and spiny) artichokes, more often the stems are eaten after being braised in cooking liquid. The flower buds of wild cardoons are still widely collected and used in southern Italy and Sicily.^[11] In Spain and Portugal, the flower buds are also employed in cheesemaking: the pistils of the cardoon flower are used as a vegetable rennet in the making of some cheeses such as the Torta del Casar and the Torta de la Serena cheeses in Spain, or the azeitão cheese in Portugal. Cardoon is also part of Lyonnaise cuisine (cardoon au gratin).

Cardoon leaf stalks, which look like large celery stalks, can be served steamed or braised, and have an artichoke-like flavour. They are harvested in winter and spring, being best just before the plant flowers.^[8] In the Abruzzi region of Italy, Christmas lunch is traditionally started with a soup of cardoon cooked in chicken broth with little meatballs (lamb or, more rarely, beef), sometimes with the further addition of egg (which scrambles in the hot soup – called stracciatella) or fried chopped liver and heart.

The cardoon stalks are considered a delicacy in Spain, particularly in the northern region of Navarre, where they are grown in large quantities.^[12] Only the innermost, white stalks are considered edible, a reason for which in Spain cardoons are usually cultivated by protecting the leaf stalks from the sunlight, often by burying them underground; thus, cardoon plantations in Spain are often formed by characteristic earth mounds surrounding each plant, the earth covering the stalks.^[13] In Spain, cardoons are typically cooked by first boiling the stalks to soften them, and then adding simple sauces such as almond sauce or small amounts of jamón; they are sometimes combined with clams, artichokes, or beans as well. Because of their seasonality (from November to February), cardoons are a staple of the Christmas dinner in Navarre and the surrounding regions; for the same reason, cardoons are often sold as vegetable preserves, usually in water or brine, so that they can be eaten all year round.^[12] Cardoons are an ingredient in one of the national dishes of Spain, the cocido madrileño, a slow-cooking, one-pot, meat and vegetable dish simmered in broth.

In the USA, it is rarely found in stores, but available in farmers' markets, where it is available through May, June, and July. The main root can also be boiled and served cold.^[14] The stems are also traditionally served battered and fried at St. Joseph's altars in New Orleans.

It is one of the herbs used to flavour Amaro liqueur, which may be called Cardamaro.

Other uses

Cardoons are used as a vegetarian source of enzymes for cheese production. In Portugal, traditional coagulation of the curd relies entirely on this vegetable rennet. This results in cheeses such as the Nisa (D.O.P.), with a peculiar earthy, herbaceous and slightly citric flavour that bears affinity with full-bodied or fortified wines.^[15]

The cardoon is also grown as an ornamental plant for its imposing architectural appearance, with very bright silvery-grey foliage and large flowers in selected cultivars.^[5]

Cardoon has attracted recent attention as a possible source of biodiesel. The oil, extracted from the seeds of the cardoon, and called artichoke oil, is similar to safflower and sunflower oil in composition and use.^[16]

Cardoon is the feedstock for the first biorefinery in the world converting the installations of a petrochemical plant in Porto Novo, Sardinia, providing biomass and oils for the building blocks of bioplastics. Matrica, the joint venture of ENI and Novamont, will inaugurate the facility in the Fall of 2013.^[17]

Gallery

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  Cynara cardunculus - MHNT

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  Young leaves of a spiny wild plant

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  Inflorescence bud

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  Plants

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  Bud

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  Garden plant in bloom

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  Cultivated cardoons in Ágreda, Spain

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  Cardoon prepared in the Navarrese way

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  Cardoon plant in early August, Munich Botanical Garden.

References

Wikimedia Commons has media related to Cynara cardunculus.