Chestnut

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For other uses, see Chestnut (disambiguation). "Chinkapin" and "Chinquapin" redirect here; for other uses, see Chinkapin (disambiguation).

Chestnuts (Castanea), including the chinkapins, are a genus of eight or nine species of trees and shrubs in the beech family Fagaceae, native to warm temperate regions of the Northern Hemisphere. The name also refers to the edible nuts produced by these trees. Most are large trees to 20-40 m tall, but some species (the chinkapins) are smaller, often shrubby. All are deciduous.

The leaves are simple, ovate or lanceolate, 10-30 cm long and 4-10 cm broad, with sharply pointed, widely-spaced teeth, with shallow rounded sinuses between. The flowers are catkins, produced in mid summer. The fruit is a spiny cupule 5-11 cm diameter, containing 1-7 nuts.

Castanea species are used as food plants by the larvae of some Lepidoptera species; see list of Lepidoptera which feed on Castanea.

The American Chestnut, formerly one of the dominant trees of the eastern United States, has been almost wiped out by a fungal disease, chestnut blight, Cryphonectria parasitica. The American chinkapins are also very susceptible to chestnut blight. The European and west Asian Sweet Chestnut is susceptible, but less so than the American, and the east Asian species are resistant. These resistant species, particularly Japanese Chestnut and Chinese Chestnut but also Seguin's Chestnut and Henry's Chestnut, have been used in breeding programs in the US to create hybrids with the American chestnut that are also disease resistant.

Neither the horse chestnut (family Sapindaceae) nor the water chestnut (family Cyperaceae) is closely related to the chestnut, though both are so named for producing similar nuts.

Uses

A kestaneci or chestnut vendor in Istanbul

Nuts

The nuts are an important food crop in southern Europe, southwestern and eastern Asia, and were also, before chestnut blight, in eastern North America. In southern Europe in the Middle Ages, whole forest-dwelling communities which had scarce access to wheat flour relied on chestnuts as their main source of carbohydrates.

The nuts can be eaten candied, boiled or roasted; the former are often sold under the French name marrons glacés. One easy method for roasting is to cut a slit in the top of each nut and heat in a shallow container, tossing occasionally, at 200-220 °C for 10-15 minutes.

Another important use of chestnuts is to be ground into flour, which can then be used to prepare bread, cakes and pasta.

Chestnut-based recipes and preparations are making a comeback in Italian cuisine, as part of the trend toward rediscovery of traditional dishes.

To preserve chestnuts to eat through the winter, they must be made perfectly dry after they come out of their green husk; then put into a box or a barrel mixed with, and covered over by, fine and dry sand, three parts of sand to one part of chestnuts. Any maggots in any of the chestnuts will emerge and work up through the sand to get to the air without damaging other chestnuts. Chestnuts to be grown in the spring need to be kept in moist sand and chilled over the winter.

Other products

The wood is similar to oak wood in being decorative and very durable. Due to disease, American Chestnut wood has almost disappeared from the market. It is difficult to obtain large size timber from the Sweet Chestnut, due to the high degree of splitting and warping when it dries. The wood of the Sweet Chestnut is most used in small items where durability is important, such as fencing and wooden outdoor cladding ('shingles') for buildings. In Italy, it is also used to make barrels used for aging balsamic vinegar.

The bark was also a useful source of natural tannins, used for tanning leather before the introduction of synthetic tannins.

Image:Chestnut.jpg|Ripe Sweet Chestnuts Image:Chestnuts.jpg|Chestnuts inside their spiky capsule Image:Chestnut03.jpg|Chestnuts can be found on the ground around trees Image:Chestnut tree.jpg|A Sweet Chestnut tree Image:Chestnut tree02.jpg|A Sweet Chestnut tree Image:Chestnut flowers.jpg|Sweet Chestnut male catkins (pale buff) and female catkins (green, spiny, partly hidden by leaves) Image:Young chestnuts.jpg|Young chestnuts

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