Peach

This article is about the tree. For the Nintendo character, see Princess Peach. For other uses, see Peach (disambiguation).Princess peach is hot!

Peach
Foliage and fruit
Scientific classification
Kingdom:	Plantae
Division:	Magnoliophyta
Class:	Magnoliopsida
Order:	Rosales
Family:	Rosaceae
Genus:	Prunus
Subgenus:	Amygdalus
Species:	P. persica
Binomial name
Prunus persica (L.) Batsch

Peaches (edible part)

Nutritional value per 100 g (3.5 oz)
Energy	165 kJ (39 kcal)
Carbohydrates	9.5 g
Sugars	8.4 g
Dietary fibre	1.5 g
Fat	0.3 g
Protein	0.9 g
Vitamins	Quantity %DV†
Vitamin C	7% 6.6 mg
†Percentages estimated using US recommendations for adults, except for potassium, which is estimated based on expert recommendation from the National Academies.

The peach (Prunus persica) is a species of Prunus native to China that bears an edible juicy fruit also called a peach.

It is a deciduous tree growing to 5–10 m tall, belonging to the subfamily Prunoideae of the family Rosaceae. It is classified with the almond in the subgenus Amygdalus within the genus Prunus, distinguished from the other subgenera by the corrugated seed shell.

The leaves are lanceolate, 7–15 cm long and 2–3 cm broad. The flowers are produced in early spring before the leaves; they are solitary or paired, 2.5–3 cm diameter, pink, with five petals. The fruit is a drupe, with a single large seed encased in hard wood (called the "stone" or "pit"), yellow or whitish flesh, a delicate aroma, and a skin that is either velvety (peaches) or smooth (nectarines) in different cultivars. The flesh is very delicate and easily bruised in some cultivars, but is fairly firm in some commercial cultivars, especially when green. The seed is red-brown, oval shaped and 1.5-2 cm long. Peaches, along with cherries, plums and apricots, are stone fruits (drupes).

The scientific name persica, along with the word "peach" itself and its cognates in many European languages, derives from an early European belief that peaches were native to Persia (now Iran). The modern botanical consensus is that they originate in China, and were introduced to Persia and the Mediterranean region along the Silk Road before Christian times. Cultivated peaches are divided into "freestone" and "clingstone" cultivars, depending on whether the flesh sticks to the stone or not; both kinds can have either white or yellow flesh. Peaches with white flesh typically are very sweet with little acidity, while yellow-fleshed peaches typically have an acidic tang coupled with sweetness, though this also varies greatly. Both colours often have some red on their skin. Low-acid white-fleshed peaches are the most popular kinds in China, Japan, and neighbouring Asian countries, while Europeans and North Americans have historically favoured the acidic, yellow-fleshed kinds.

Cultivation

Harvested peaches

Peach trees grow very well in a fairly limited range, since they have a chilling requirement that subtropical areas cannot satisfy, and they are not very cold-hardy. The trees themselves can usually tolerate temperatures to around −26 °C to −30 °C, although the following season's flower buds are usually killed at these temperatures, leading to no crop that summer. Flower bud kill begins to occur at temperatures between −15 °C and −25 °C depending on the cultivar (some are more cold-tolerant than others) and the timing of the cold, with the buds becoming less cold tolerant in late winter. Certain cultivars are more tender and others can tolerate a few degrees more cold. In addition, a lot of summer heat is required to mature the crop, with mean temperatures of the hottest month between 20 °C and 30 °C. Another problematic issue in many peach-growing areas is spring frost. The trees tend to flower fairly early in spring. The flowers can often be damaged or killed by freezes; typically, if temperatures drop below about −4 °C, most flowers will be killed. However, if the flowers are not fully open, they can tolerate a couple degrees colder.

Important historical peach-producing areas are China and Iran, France, and the Mediterranean countries like Italy, Spain and Greece. More recently, the United States (where the three largest producing states are California, South Carolina, and Georgia), Canada (southern Ontario and British Columbia), and Australia (the Riverland region) have also become important. Oceanic climate areas like the Pacific Northwest and the British Isles are generally not satisfactory for peach growing due to inadequate summer heat, though they are sometimes grown trained against south-facing walls to catch extra heat from the sun. Trees grown in a sheltered and south-facing position in the southeast of England are capable of producing both flowers and a large crop of fruit. Peach trees are the second most commonly cultivated fruit trees in the world after apple trees.

Nectarines

Nectarine

The nectarine is a cultivar group of peach that has a smooth, fuzzless skin. Though fuzzy peaches and nectarines are commercially regarded as different fruits, with nectarines often erroneously believed to be a crossbreed between peaches and plums, or a "peach with a plum skin", they belong to the same species as peaches. Several genetic studies have concluded in fact that nectarines are created due to a recessive gene, whereas a fuzzy peach skin is dominant. Nectarines have arisen many times from peach trees, often as bud sports.

As with peaches, nectarines can be white or yellow, and clingstone or freestone. On average, nectarines are slightly smaller and sweeter than peaches, but with much overlap. The lack of skin fuzz can make nectarine skins appear more reddish than those of peaches, contributing to the fruit's plum-like appearance. The lack of down on the skin also means their skin is more easily bruised than peaches.

The history of the nectarine is unclear; the first recorded mention in English is from 1616, but they had probably been grown much earlier within the native range of the Peach in central and eastern Asia.

Regular peach trees occasionally produce a few nectarines, and vice versa.

Diseases

Main article: List of peach and nectarine diseases

The trees are prone to a disease called leaf curl, which usually does not directly affect the fruit but does reduce the crop yield by partially defoliating the tree. The fruit is very susceptible to brown rot.

Planting

Peach and nectarine output in 2005

Most peach trees sold by nurseries are named cultivars grafted onto a suitable rootstock. It is also possible to grow a tree from either a peach or nectarine seed, but the fruit quality of the resulting tree will be very unpredictable.

Peaches should be located in full sun, and with good air flow. This allows cold air to flow away on frosty nights and keeps the area cool in summer. Peaches are best planted in early winter, as this allows time for the roots to establish and be able to sustain the new spring growth. When planting in rows, plant north-south.

Watering

For optimum growth, peach trees require a constant supply of water. This should be increased shortly before the harvest. The best tasting fruit is produced when the peach is watered throughout the season. Drip irrigation is ideal, at least one dripper per tree. Although it is better to use multiple drippers around the tree, this is not necessary. A quarter of the root being watered is sufficient.

Fertilising

Peaches have a high nutrient requirement, needing more nitrogen than most other fruit trees. An NPK fertiliser can be applied regularly, and an additional mulch of poultry manure in autumn soon after the harvest will benefit the tree. If the leaves of the peach are yellow or small, the tree needs more nitrogen. Blood meal and bone meal, 3–5 kg per mature tree, or calcium ammonium nitrate, 0.5–1 kg, are suitable fertilisers. This also applies if the tree is putting forth little growth.

Tips for good fruit

If the full amount of peaches is left, they will be under-sized and lacking in sugar and flavour. In dry conditions, extra watering is important. The fruit should be thinned when they have reached 2 cm in diameter, usually about 2 months after flowering. Fresh fruit are best consumed on the day of picking, and do not keep well. They are best eaten when the fruit is slightly soft, having aroma, and heated by the sun.

Peaches in Asian tradition

Pan Tao, the Chinese flat peach. Called paraguaya, too.

Peaches are known in China, Japan, Korea, and Vietnam not only as a popular fruit but for the many folktales and traditions associated with it. Momotaro, one of Japan's most noble and semi-historical heroes, was born from within an enormous peach floating down a stream. Momotaro or "Peach Boy" went on to fight evil oni and face many adventures. Peach flowers are admired by the Japanese but not as much as the sakura (cherry).

In China, the peach was said to be consumed by the immortals due to its mystic virtue of conferring longevity on all who ate them. The divinity Yu Huang, also called the Jade Emperor, and his mother called Xi Wangmu also known as Queen Mother of the West. Xi Wangmu ensured the gods' everlasting existence by feeding them the peaches of immortality. The immortals residing in the palace of Xi Wangmu were said to celebrate an extravagant banquet called the Pantao Hui or "The Feast of Peaches". The immortals waited six thousand years before gathering for this magnificent feast; the peach tree put forth leaves once every thousand years and it required another three thousand years for the fruit to ripen. Ivory statues depicting Xi Wangmu's attendants often held three peaches.

The peach often plays an important part in Chinese tradition and is symbolic of long life. One example is in the peach-gathering story of Zhang Daoling, who many say is the true founder of Taoism. Elder Zhang Guo, one of the Chinese Eight Immortals, is often depicted carrying a Peach of Immortality. The peach blossoms are also highly prized in Chinese culture, ranked slightly lower than mei blossom.

It was in an orchard of flowering peach trees that Liu Bei, Guan Yu, and Zhang Fei took an oath of brotherhood in the opening chapter of the classic Chinese novel Romance of the Three Kingdoms.

Due to its delicious taste and soft texture, in ancient China "peach" was also a slang word for "young bride", and it has remained in many cultures as a way to define young women (as in English, with peachy or peachy keen).

Gallery

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  Peach flower
• 
  Flavorcrest peaches
• 
  Autumn Red peaches
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  A peach dessert
• 
  Peach (cultivar 'Berry') - watercolour 1895
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  Peaches in syrup
• A sliced peach
  A sliced peach
• 

Popular culture

Valentin Serov's The girl with peaches (1887) was the painting that inaugurated Russian Impressionism.

• The peach is the state flower of Delaware and the state fruit of South Carolina. The state of Georgia calls itself the "Peach State".
• Cosmo Kramer, a character on Seinfeld, eats a "Mackinaw peach" which is presumed to be a peach from Oregon.
• The peach is featured in the children's novel James and the Giant Peach.
• Eat a Peach is the name of an album released by Georgia Southern Rock Band, The Allman Brothers Band.
• T. S. Eliot, in "The Love Song of J. Alfred Prufrock" asks "Shall I part my hair behind? Do I dare to eat a peach?"
• Baseball player Ty Cobb was nicknamed "The Georgia Peach".
• "Peaches" is a 1994 single by The Presidents of the United States of America.
• In the Super Mario Bros. series, there is a princess named Princess Peach.
• In the film Labyrinth, Jareth, the Goblin King (played by David Bowie), uses a peach to induce a hallucination to slow down Sarah Williams (portrayed by Jennifer Connelly), and hinder her efforts in retrieving her stepbrother Toby.
• The 1986 Irish film "Eat the Peach" refers to Prufrock and the idea of acting on your dreams.
• A peach sliced in half is used as a symbolism for the vagina in many world cultures where the fruit is native (the middle and far east, especially). The visual similarity is sometimes used to replace what would otherwise be considered vulgar in description, or alternatively used in crude humor.
• Peach harvesting and cultivation take on a large historical and symbolic role of John Steinbeck's novel, The Grapes of Wrath. Peaches grown in the Salinas Valley in California are sold as luxury cash crops and its nutritional value is not considered. This stands in marked contrast with the harvesters actually collecting the peaches, who can barely earn enough to feed their families on far less desirable foodstuffs. In this manner, peaches are also used as a literary device that recalls the story of Tantalus in Greek Mythology. Like the harvesters, Tantalus is denied food and is forced to stare at fruit in a tree that is beyond his reach.

External links

• Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN 0-333-47494-5.
• National Center for Home Food Preservation - Freezing Peaches
• Prunus persica images at bioimages.vanderbilt.edu