This article is about the tree and its fruit. For other uses, see Peach (disambiguation), Peaches (disambiguation), and Peachtree (disambiguation).
Peach
Illustration Prunus persica0.jpg
Peach flower, fruit, seed and leaves as illustrated by Otto Wilhelm Thomé (1885).
Autumn Red peaches.jpg
Autumn Red peaches, cross section
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rosaceae
Genus: Prunus
Subgenus: Amygdalus
Species: P. persica
Binomial name
Prunus persica
(L.) Batsch 1801 not Stokes 1812 nor (L.) Siebold & Zucc. 1845[1]
Synonyms[2]
Synonymy[show]
The peach (Prunus persica) is a deciduous tree native to the region of Northwest China between the Tarim Basin and the north slopes of the Kunlun Shan mountains, where it was first domesticated and cultivated.[3] It bears an edible juicy fruit called a peach or a nectarine.

The specific epithet persica refers to its widespread cultivation in Persia (modern-day Iran), whence it was transplanted to Europe. It belongs to the genus Prunus which includes the cherry, apricot, almond and plum, in the rose family. The peach is classified with the almond in the subgenus Amygdalus, distinguished from the other subgenera by the corrugated seed shell.

Peach and nectarines are the same species, even though they are regarded commercially as different fruits. In contrast to peaches, whose fruits present the characteristic fuzz on the skin, nectarines are characterized by the absence of fruit-skin trichomes (fuzz-less fruit); genetic studies suggest nectarines are produced due to a recessive allele, whereas peaches are produced from a dominant allele for fuzzy skin
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 (0.79–1.18 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, or Indian Blood Peach, which arrives in the latter part of the summer, and can have color ranging from red and white, to purple.[6]

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 colors 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 cultivars.
Peaches grow in a fairly limited range in dry, continental or temperate climates, since the trees have a chilling requirement that tropical or subtropical areas generally cannot satisfy except at high altitudes (for example in parts of Ecuador, Colombia, Ethiopia, India, and Nepal). Most cultivars require 500 hours of chilling around 0 to 10 °C (32 to 50 °F). During the chilling period, key chemical reactions occur, but the plant appears dormant. Once the chilling period is fulfilled, the plant enters a second type of dormancy, the quiescence period. During quiescence, buds break and grow when sufficient warm weather favorable to growth is accumulated.[19]

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, preventing a crop that summer. Flower bud death begins to occur between −15 and −25 °C (5 and −13 °F), depending on the cultivar and on the timing of the cold, with the buds becoming less cold tolerant in late winter.[20]

Another climate constraint is spring frost. The trees flower fairly early (in March in western Europe) and the blossom is damaged or killed if temperatures drop below about −4 °C (25 °F). However, if the flowers are not fully open, they can tolerate a few degrees colder.

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