Peach

Peach
Peach flower
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

The Peach (Prunus persica) is a tree native to China that bears a sweet juicy fruit of the same name. It is a deciduous tree growing to 5–10 m tall, belonging to the subfamily Prunoideae. It is distinguished from the other subgenera by the corrugated seed shell of the fruit.

The scientific name persica derives from an early European belief that peaches were native to Persia (now Iran). The modern botanical consensus is that they originated in China, and were introduced to Persia and the Mediterranean region along the Silk Road in early historical times, probably by about 2000 B.C.E. (Huxley et al. 1992).

The leaves are simple,alternate,serrated ,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 in diameter, white to lavender, with five petals. The fruit has a single large seed encased in hard wood (called the "stone" or "pit"). The seed is red, oval shaped and 1.5-2 cm thick. The fruit has yellow or whitish flesh with a delicate aroma and a velvety skin that bruises easily. Peaches, along with cherries, plums and apricots, are classified as stone fruits or drupes.

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 a more acidic taste. 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.

Nectarines

The nectarine is a cultivar group of peach that has a smooth, non fuzzy skin. Though grocers treat fuzzy peaches and nectarines as different fruits, they belong to the same species. Nectarines have arisen many times from fuzzy peaches, often as bud sports. Nectarines can be white, yellow, clingstone, or freestone. Regular peach trees occasionally produce a few nectarines, and vice versa. Their flesh is more easily bruised than peaches. The history of the nectarine is unclear; the first recorded mention is from 1616 in England, but they had probably been grown much earlier in central Asia.

Cultivation

Nectarine

Peach trees grow very well in a fairly limited range, since they have a chilling requirement at 33 - 45 degress F. that subtropical areas cannot satisfy, and they are not very cold-hardy. Most U.S. cultivars require 750 to 1,000 hours of chilling in order for the trees to bloom and grow properly (N.Carolina State Univ.). 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 (Szalay et al. 2000). 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 bloom fairly early in spring, around the same time as daffodils. The blossoms can often be damaged or killed by freezes . If temperatures drop below about −4 °C, most blossoms will be killed. However, if the blooms are not fully open, they can tolerate a couple degrees colder temperature.

Important historical peach-producing areas are China, Japan, Iran, Turkey, and other countries in the Mediterranean region, where they have been grown for thousands of years. More recently, the U.S. (California, Colorado, New Jersey, South Carolina, Michigan, Texas, Alabama, Georgia, Virginia, West Virginia, Maryland, Delaware, Washington, Oregon), Canada (southern Ontario and British Columbia), and Australia (the Riverland region) have also become important. Most peach trees sold by nurseries are grafted cultivars.

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

It is possible to grow a tree from either a Peach or Nectarine seed. The germinated seed requires a south or west-facing position and regular watering.

Peaches should be located in full sun 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,with 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.

Soil and Fertilising

Peach trees, like other fruit trees,do best in deep ,well-drained soils with a pH of 6.0 - 6.5. Peaches have a high nutrient requirement, needing more nitrogen than most other fruit trees. A nitrogen,phosphorus ,potassium 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

Peach trees have a tendency to produce too much fruit. The fruit needs to be thinned out in order for the remaining fruit to be of a marketable size and have good flavor. 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

Peaches are known in China and Japan not only as a popular fruit but for the many folktales and traditions associated with it. Momotaro, one of Japan's most noble mythical 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. The flowers of the flowering peach 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 had a garden of "immortal peaches". Whoever ate one of these peaches lived forever.His mother called Xi Wangmu or Queen Mother of the West 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.

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 pretty young women (as in English, with peachy or peachy keen).

Gallery

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  Flavorcrest peaches

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  Autumn Red peaches

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  Peach (cultivar 'Berry') - watercolour 1895

References

ISBN links support NWE through referral fees

• Szalay,L., J. Papp, Z. Szaóbo . 2000.EVALUATION OF FROST TOLERANCE OF PEACH VARIETIES IN ARTIFICIAL FREEZING TESTS in ISHS Acta Horticulturae 538: Eucarpia symposium on Fruit Breeding and Genetics [1].

• North Carolina State University, North Carolina Co-operative extension service,viewed 6-25-2007 [2]

• Huxley, A. et al. (eds.) 1992. The New RHS Dictionary of Gardening. Macmillan.
• National Center for Home Food Preservation - Freezing Peaches
• Prunus persica images at bioimages.vanderbilt.edu
• [3]

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