|Autumn Red Peaches, cross section|
The peach, Prunus persica, is a deciduous tree, native to China and South Asia, where it was first cultivated. It bears an edible juicy fruit also called a peach. The species name persica refers to its widespread cultivation in Persia, whence it was transplanted to Europe. It belongs to the genus Prunus which includes the cherry and plum, in the family Rosaceae. The peach is classified with the almond in the subgenus Amygdalus, distinguished from the other subgenera by the corrugated seed shell.
Peaches and nectarines are the same species, even though they are regarded commercially as different fruits. Nectarines have smooth skin, while peaches have fuzzy skin; genetic studies suggest nectarines are produced due to a recessive allele, whereas peaches are produced from dominant allele for fuzzy skin.
China is the world's largest producer of peaches and nectarines.
Prunus persica grows to 4–10 m (13–33 ft) tall and 6 in. in diameter. The leaves are lanceolate, 7–16 cm (2.8–6.3 in) long, 2–3 cm (0.79–1.2 in) broad, pinnately veined. 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 has 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 varieties, especially when green. The single, large seed is red-brown, oval shaped, approximately 1.3–2 cm long, and is surrounded by a wood-like husk. Peaches, along with cherries, plums and apricots, are stone fruits (drupes). There are various heirloom varieties, including the Indian peach, which arrives in the latter part of the summer.
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. The Ancient Romans referred to the peach as malum persicum "Persian apple", later becoming French pêche, hence the English "peach".
Cultivated peaches are divided into clingstones and freestones, depending on whether the flesh sticks to the stone or not; both 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.
Although its botanical name Prunus persica refers to Persia (present Iran) from where it came to Europe, genetic studies suggest peaches originated in China, where they have been cultivated since the early days of Chinese culture, circa 2000 BCE. Peaches were mentioned in Chinese writings as far back as the 10th century BCE and were a favoured fruit of kings and emperors. As of late, the history of cultivation of peaches in China has been extensively reviewed citing numerous original manuscripts dating back to 1100 BCE.
The peach was brought to India and Western Asia in ancient times. Peach cultivation also went from China, through Persia, and reached Greece by 300 BCE. Alexander the Great introduced the fruit into Europe after he conquered the Persians. Peaches were well known to the Romans in first century AD, and was cultivated widely in Emilia-Romagna. Peach tree is portrayed in the domuswall paintings of the towns destroyed by the Vesuvius eruption of 79 AD, with the oldest artistic representations of peach fruit, discovered so far, are in the two fragments of wall paintings, dated back to the 1st century AD, in Herculaneum, now preserved in the National Archaeological Museum in Naples.
Peach was brought to the Americas by Spanish explorers in the 16th century, and eventually made it to England and France in the 17th century, where it was a prized and expensive treat. The horticulturist George Minifie supposedly brought the first peaches from England to its North American colonies in the early 17th century, planting them at his Estate of Buckland in Virginia. Although Thomas Jefferson had peach trees at Monticello, United States farmers did not begin commercial production until the 19th century in Maryland, Delaware, Georgia and finally Virginia.
In April 2010, an International Consortium, The International Peach Genome Initiative (IPGI), that include researchers from USA, Italy, Chile, Spain and France announced they had sequenced the peach tree genome (doubled haploid Lovell).
Peaches grow very well in a fairly limited range, since they have a chilling requirement that low altitude tropical areas cannot satisfy. In tropical and equatorial latitudes, such as Ecuador, Colombia, Ethiopia, India and Nepal, they grow at higher altitudes that can satisfy the chilling requirement. The trees themselves can usually tolerate temperatures to around -26 to -30 °C (-15 to -22 °F), 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 between -15 and -25 °C (5 and -13 °F), 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.
Typical peach cultivars begin bearing fruit in their third year and have a lifespan of about 12 years. Most cultivars require between 600 and 1,000 hours of chilling; cultivars with chilling requirements of 250 hours (10 days) or less have been developed enabling peach production in warmer climates. During the chilling period, key chemical reactions occur before the plant begins to grow again. Once the chilling period is met, the plant enters the so-called quiescence period, the second type of dormancy. During quiescence, buds break and grow when sufficient warm weather favorable to growth is accumulated. Quiescence is the phase of dormancy between satisfaction of the chilling requirement and the beginning of growth.
Certain cultivars are more tender, and others can tolerate a few degrees colder. In addition, intense summer heat is required to mature the crop, with mean temperatures of the hottest month between 20 and 30 °C (68 and 86 °F). Another problematic issue in many peach-growing areas is spring frost. The trees tend to flower fairly early in spring. The blooms often can be damaged or killed by freezes; typically, if temperatures drop below about −4 °C (25 °F), most flowers will be killed. However, if the flowers are not fully open, they can tolerate a few degrees colder.
There are hundreds of peach and nectarine cultivars. These are classified into two categories—the freestones and the clingstones. Freestones are those for whom the fruit flesh separates readily from the pit. Clingstones are those for whom the flesh clings tightly to the pit. Some cultivars are partially freestone and clingstone, and these are called semi-free. Freestone types are preferred for eating fresh, while clingstone for canning. The fruit flesh may be creamy white or deep yellow; the hue and shade of the color depends on the cultivar.
Peach breeding has favored cultivars with more firmness, more red color, and shorter fuzz on fruit surface. These characteristics ease shipping and supermarket sales by improving eye appeal. However, this selection process has not necessarily led to increased flavor. Peaches have short shelf life, so commercial growers typically plant a mix of different cultivars in order to have fruit to ship all season long.
Peach trees need full sun, and a layout that allows good natural air flow to assist the thermal environment for the tree. Peaches are planted in early winter. During the growth season, peach trees need a regular and reliable supply of water, with higher amounts just before harvest.
Peaches need nitrogen rich fertilizers, more than other fruit trees. Without regular fertilizer supply, peach tree leaves start turning yellow or exhibit stunted growth. Blood meal, bone meal, and calcium ammonium nitrate are suitable fertilizers.
The number of flowers on a peach tree are typically thinned out, because if full number of peaches mature on a branch, they are under-sized and lacking in flavor. Fruits are thinned midway in the season by commercial growers. Fresh peaches are easily bruised, and do not store well. They are most flavorful when they ripen on the tree and eaten the day of harvest.
The peach tree can be grown in an espalier shape. The Baldassari palmette is a palmette design created around 1950 used primarily for training peaches. In walled gardens constructed from stone or brick, which absorb and retain solar heat and then slowly release it, raising the temperature against the wall, peaches can be grown as espaliers against south-facing walls as far north as southeast Great Britain and southern Ireland.
Interaction with fauna 
The larvae of such moth species as the peachtree borer (Synanthedon exitiosa), the yellow peach moth (Conogethes punctiferalis), the well-marked cutworm (Abagrotis orbis), Lyonetia prunifoliella, Phyllonorycter hostis, the fruit tree borer (Maroga melanostigma), Parornix anguliferella, Parornix finitimella, Caloptilia zachrysa, Phyllonorycter crataegella, Trifurcula sinica, the Suzuki's Promolactis moth (Promalactis suzukiella), the white-spotted tussock moth (Orgyia thyellina), the apple leafroller (Archips termias), the catapult moth (Serrodes partita), the wood groundling (Parachronistis albiceps) or the omnivorous leafroller (Platynota stultana) are reported to feed on P. persica.
The flatid planthopper (Metcalfa pruinosa) is also causing damage in fruit plantations.
The tree is also a host plant for such species as the Japanese beetle (Popillia japonica), the unmonsuzume (Callambulyx tatarinovii), the Promethea silkmoth (Callosamia promethea), the orange oakleaf (Kallima inachus), Langia zenzeroides, the speckled emperor (Gynanisa maja) or the brown playboy (Deudorix antalus).
Peach 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, or a dark reddish spot.
Peaches and nectarines are best stored at temperatures of 0°C (32°F) and high-humidity. They are highly perishable, and typically consumed or canned within two weeks of harvest.
The variety P. persica var. nucipersica (or var. nectarina), commonly called nectarine, has a smooth skin. It is on occasion referred to as a "shaved peach", "fuzzy-less peach" or "shaven peach" due to its lack of fuzz or short hairs. Though fuzzy peaches and nectarines are regarded commercially as different fruits, with nectarines often erroneously believed to be a crossbreed between peaches and plums, or a "peach with a plum skin", nectarines belong to the same species as peaches. Several genetic studies have concluded nectarines are produced due to a recessive allele, 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 nectarines' 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. Although one source states that nectarines were introduced into the United States by David Fairchild of the Department of Agriculture in 1906, a number of colonial era newspaper articles make reference to nectarines being grown in the United States prior to the Revolutionary War. The 28 March 1768 edition of the "New York Gazette" (p. 3), for example, mentions a farm in Jamaica, Long Island, New York, where nectarines were grown.
Peacherine is claimed to be a cross between a peach and a nectarine, and are marketed in Australia and New Zealand. The fruit is intermediate in appearance between a peach and a nectarine, large and brightly colored like a red peach. The flesh of the fruit is usually yellow but white varieties also exist. The Koanga Institute lists varieties that ripen in the Southern hemisphere in February and March.
In 1909, Pacific Monthly mentioned peacherines in a news bulletin for California. Louise Pound, in 1920, claimed the term peacherine is an example of language stunt.
|Top ten peach and nectarine producers
2010 (million metric tons)
|Source: Food & Agriculture Organization|
Important historical peach-producing areas are China, Iran, and the Mediterranean countries, such as France, Italy, Spain and Greece. More recently, the United States (where the three largest producing states are California, South Carolina, and Georgia), Georgia is also known as the "Peach State" because of the production of its peaches. Canada (British Columbia), and Australia (the Riverland region) have also become important; peach growing in the Niagara Peninsula of Ontario, Canada, was formerly intensive, but slowed substantially in 2008 when the last fruit cannery in Canada was closed by the proprietors. Oceanic climate areas, like the Pacific Northwest and coastline of northwestern Europe, are generally not satisfactory for growing peaches 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. In Vietnam, the most famous variety of peach fruit product is grown in Mẫu Sơn commune, Lộc Bình district, Lạng Sơn province.
For home gardeners, semi-dwarf (3 to 4 m (9.8 to 13 ft)) and dwarf (2 to 3 m (6 ft 7 in to 9 ft 10 in)) varieties have been developed by grafting desirable cultivars onto dwarfing rootstock. Fruit size is not affected. Another mutation is flowering peaches, selected for ornamental display rather than fruit production.
The State of Georgia, in the U.S., has long been known as a centre for growers and consumers of peaches. In 2012, the peach season is expected to be earlier than usual. Like 2011, 2012 is expected to be a bumper year for peaches in Georgia, reflecting an overall favorable trajectory for peaches generally.
The most productive farms for peaches and nectarines, on average, were in Austria. In comparison to world average yield of 13 metric tons per hectare, Austrian farm yields topped 40 metric tonnes per hectare for each of the years between 2006 and 2010, with highest observed average yield of 56.8 metric tonnes per hectare in 2010.
Depending on climate and cultivar, peach harvest can occur from late May into August (Northern Hemisphere); harvest from each tree lasts about a week.
Cultural significance 
Peaches are not only a popular fruit, but are symbolic in many cultural traditions, such as in art, paintings and folk tales such as Peaches of Immortality.
Peach blossoms are highly prized in Chinese culture. The ancient Chinese believed the peach to possess more vitality than any other tree because their blossoms appear before leaves sprout. When early rulers of China visited their territories, they were preceded by sorcerers armed with peach rods to protect them from spectral evils. On New Year's Eve, local magistrates would cut peach wood branches and place them over their doors to protect against evil influences. Peach kernels (桃仁 táo rén) are a common ingredient used in traditional Chinese medicine to dispel blood stasis, counter inflammation and reduce allergies.
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. Another peach forest, the “Peach Blossom Spring” by poet Tao Yuanming is the setting of the favourite Chinese fable and a metaphor of utopias. A peach tree growing on a precipice was where the Taoist master Zhang Daoling tested his disciples.
Momotaro, one of Japan's most noble and semihistorical 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.
In Korea, peaches have been cultivated from ancient times. According to Samguk Sagi, peach trees were planted during the Three Kingdoms of Korea period, and Sallim gyeongje also mentions cultivation skills of peach trees. The peach is seen as the fruit of happiness, riches, honours and longevity. It is one of the ten immortal plants and animals, so peaches appear in many minhwa (folk paintings). Peaches and peach trees are believed to chase away spirits, so peaches are not placed on tables for jesa (ancestor veneration), unlike other fruits.
A Vietnamese mythic history states that, in the spring of 1789, after marching to Ngọc Hồi and then winning a great victory against invaders from the Qing Dynasty of China, the King Quang Trung ordered a messenger to gallop to Phú Xuân citadel (now Huế) and deliver a flowering peach branch to the Princess Ngọc Hân. This took place on the fifth day of the first lunar month, two days before the predicted end of the battle. The branch of peach flowers that was sent from the north to the centre of Vietnam was not only a message of victory from the King to his wife, but also the start of a new spring of peace and happiness for all the Vietnamese people. In addition, since the land of Nhật Tân had freely given that very branch of peach flowers to the King, it became the loyal garden of his dynasty.
It was by a peach tree that the protagonists of the Tale of Kieu fell in love. And in Vietnam, the blossoming peach flower is the signal of spring. Finally, peach bonsai trees are used as decoration during Vietnamese New Year (Tết) in northern Vietnam.
Many famous artists have painted still life with peach fruits placed in prominence. Caravaggio, Vicenzo Campi, Pierre Auguste Renoir, Claude Monet, Edouard Manet, Henri Jean Fantin-Latour, George Forster, James Peale, Severin Roesen, Peter Paul Rubens, Van Gogh are among the many influential artists who painted peaches and peach trees in various settings. Scholars suggest that many compositions are symbolic, some an effort to introduce realism. For example, Tresidder claims the artists of Renaissance symbolically used peach to represent heart, and a leaf attached to the fruit as the symbol for tongue, thereby implying speaking truth from one's heart; a ripe peach was also a symbol to imply a ripe state of good health. Caravaggio paintings introduce realism by painting peach leaves that are molted, discolored or in some cases have wormholes - conditions common in modern peach cultivation.
Nutrition and research 
|Nutritional value per 100 g (3.5 oz)|
|Energy||165 kJ (39 kcal)|
|- Sugars||8.39 g|
|- Dietary fiber||1.5 g|
|Vitamin A equiv.||16 μg (2%)|
|- beta-carotene||162 μg (2%)|
|Thiamine (vit. B1)||0.024 mg (2%)|
|Riboflavin (vit. B2)||0.031 mg (3%)|
|Niacin (vit. B3)||0.806 mg (5%)|
|Pantothenic acid (B5)||0.153 mg (3%)|
|Vitamin B6||0.025 mg (2%)|
|Folate (vit. B9)||4 μg (1%)|
|Choline||6.1 mg (1%)|
|Vitamin C||6.6 mg (8%)|
|Vitamin E||0.73 mg (5%)|
|Vitamin K||2.6 μg (2%)|
|Calcium||6 mg (1%)|
|Iron||0.25 mg (2%)|
|Magnesium||9 mg (3%)|
|Manganese||0.061 mg (3%)|
|Phosphorus||20 mg (3%)|
|Potassium||190 mg (4%)|
|Sodium||0 mg (0%)|
|Zinc||0.17 mg (2%)|
|Link to USDA Database entry
Percentages are relative to
US recommendations for adults.
Source: USDA Nutrient Database
A medium peach weighs 75 g (2.6 oz) and typically contains 30 Cal, 7 g of carbohydrate (6 g sugars and 1 g fibre), 1 g of protein, 140 mg of potassium, and 8% of the daily value (DV) for vitamin C. Nectarines have a small amount more of vitamin C, provide double the vitamin A, and are a richer source of potassium than peaches.
As with many other members of the rose family, peach seeds contain cyanogenic glycosides, including amygdalin (note the subgenus designation: Amygdalus). These substances are capable of decomposing into a sugar molecule and hydrogen cyanide gas. While peach seeds are not the most toxic within the rose family—that dubious honour going to the bitter almond—large doses of these chemicals from any source are hazardous to human health.
Peach allergy or intolerance is a relatively common form of hypersensitivity to proteins contained in peaches and related fruit (almonds). Symptoms range from local symptoms (e.g. oral allergy syndrome, contact urticaria) to systemic symptoms, including anaphylaxis (e.g. urticaria, angioedema, gastrointestinal and respiratory symptoms). Adverse reactions are related to the "freshness" of the fruit: peeled or canned fruit may be tolerated.
More than 80 chemical compounds contribute to the peach aroma. Among others are found C6 gamma-lactones, C8 and C10 (gamma-decalactone), C10 delta-lactone, several esters (such as linalyl butyrate or linalyl formate), acids and alcohols, and benzaldehyde.
In other products 
The odour of the synthetic chemical weapon agent cyclosarin is also described as resembling peach.
Phenolic composition 
Total phenolics in mg/100 g of fresh weight were 14–102 in white-flesh nectarines, 18–54 in yellow-flesh nectarines, 28–111 in white-flesh peaches, 21–61 in yellow-flesh peaches. The major phenolic compounds identified in peach are chlorogenic acid, (+)-catechin and (-)-epicatechin. Other compounds, identified by HPLC, are gallic acid, neochlorogenic acid, procyanidin B1 and B3, procyanidin gallates, ellagic acid.
Peach is a color named for the pale color of the interior flesh of the peach fruit.
The Peachoid is a four-story (150 feet tall) water tower in Gaffney, South Carolina, United States, that resembles a peach.
Farmer at work in Colorado, 1940
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