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The cherry blossom, or sakura, is the
flower Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...
of trees in ''
Prunus ''Prunus'' is a genus of flowering plant, flowering trees and shrubs from the family (biology), family Rosaceae. The genus includes plums, cherries, peaches, nectarines, apricots and almonds (collectively Drupe, stonefruit). The genus has a cosm ...
'' subgenus '' Cerasus''. ''Sakura'' usually refers to flowers of ornamental cherry trees, such as
cultivar A cultivar is a kind of Horticulture, cultivated plant that people have selected for desired phenotypic trait, traits and which retains those traits when Plant propagation, propagated. Methods used to propagate cultivars include division, root a ...
s of ''
Prunus serrulata ''Prunus serrulata'' or Japanese cherry is a species of cherry tree that grows wild in Japan, China, Korea, Vietnam, Taiwan, Laos, Myanmar, Thailand, Cambodia, India, Bangladesh, Bhutan, Nepal, Sri Lanka, Pakistan, Philippines, Malaysia, Indones ...
'', not trees grown for their fruit (although these also have
blossom In botany, blossoms are the flowers of stone fruit trees (genus ''Prunus'') and of some other plants with a similar appearance that flower profusely for a period of time in spring. Colloquially, flowers of orange are referred to as such as w ...
s). Cherry blossoms have been described as having a
vanilla Vanilla is a spice derived from orchids of the genus ''Vanilla (genus), Vanilla'', primarily obtained from pods of the flat-leaved vanilla (''Vanilla planifolia, V. planifolia''). ''Vanilla'' is not Autogamy, autogamous, so pollination ...
-like smell, which is mainly attributed to
coumarin Coumarin () or 2''H''-chromen-2-one is an aromatic organic chemical compound with formula . Its molecule can be described as a benzene molecule with two adjacent hydrogen atoms replaced by an unsaturated lactone ring , forming a second six-me ...
. Wild
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of cherry tree are widely distributed, mainly in the Northern Hemisphere. They are common in East Asia, especially in
Japan Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
, where they have been cultivated, producing many varieties. Most of the ornamental cherry trees planted in parks and other places for viewing are
cultivars A cultivar is a kind of cultivated plant that people have selected for desired traits and which retains those traits when propagated. Methods used to propagate cultivars include division, root and stem cuttings, offsets, grafting, tissue cult ...
developed for ornamental purposes from various wild
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
. In order to create a cultivar suitable for viewing, a wild species with characteristics suitable for viewing is needed. ''Prunus speciosa'' (Oshima cherry), which is endemic to Japan, produces many large flowers, is fragrant, easily mutates into double flowers and grows rapidly. As a result, various cultivars, known as the ''Cerasus'' Sato-zakura Group, have been produced since the 14th century and continue to contribute greatly to the development of
hanami is the Japanese traditional custom of enjoying the transient beauty of flowers; in this case almost always mean those of the or, less frequently, trees. From the end of March to early May, cherry trees bloom all over Japan, and around the s ...
(flower viewing) culture. From the modern period, cultivars are mainly propagated by
grafting Grafting or graftage is a horticulture, horticultural technique whereby tissues of plants are joined so as to continue their growth together. The upper part of the combined plant is called the scion () while the lower part is called the roots ...
, which quickly produces cherry trees with the same genetic characteristics as the original individuals, and which are excellent to look at. The Japanese word sakura ( or ; or ) can mean either the tree or its flowers (see ). The cherry blossom is considered the
national flower In a number of countries, plants have been chosen as symbols to represent specific geographic areas. Some countries have a country-wide floral emblem; others in addition have symbols representing subdivisions. Different processes have been used t ...
of Japan, and is central to the custom of hanami. Sakura trees are often called Japanese cherry in English. (This is also a
common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often con ...
for ''
Prunus serrulata ''Prunus serrulata'' or Japanese cherry is a species of cherry tree that grows wild in Japan, China, Korea, Vietnam, Taiwan, Laos, Myanmar, Thailand, Cambodia, India, Bangladesh, Bhutan, Nepal, Sri Lanka, Pakistan, Philippines, Malaysia, Indones ...
''.) The cultivation of ornamental cherry trees began to spread in
Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
and the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
in the early 20th century, particularly after Japan presented trees to the United States as a token of friendship in 1912. British plant collector
Collingwood Ingram Collingwood "Cherry" Ingram (30 October 1880 – 19 May 1981), was a British ornithologist, plant collector and gardener, who was an authority on Japanese flowering cherries. Personal life Collingwood Ingram was a son of Sir William Ingram and ...
conducted important studies of Japanese cherry trees after the
First World War World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
.


Classification

Classifying cherry trees is often confusing, since they are relatively prone to mutation and have diverse flowers and characteristics, and many
varieties Variety may refer to: Arts and entertainment Entertainment formats * Variety (radio) * Variety show, in theater and television Films * ''Variety'' (1925 film), a German silent film directed by Ewald Andre Dupont * ''Variety'' (1935 film), ...
(a sub-classification of species), hybrids between species, and cultivars exist. Researchers have assigned different scientific names to the same type of cherry tree throughout different periods. In Europe and North America, ornamental cherry trees are classified under the subgenus '' Cerasus'' ("true cherries"), within the genus ''
Prunus ''Prunus'' is a genus of flowering plant, flowering trees and shrubs from the family (biology), family Rosaceae. The genus includes plums, cherries, peaches, nectarines, apricots and almonds (collectively Drupe, stonefruit). The genus has a cosm ...
''. ''Cerasus'' consists of about 100 species of cherry tree, but does not include bush cherries,
bird cherries Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight ...
, or cherry laurels (other non-''Cerasus'' species in ''Prunus'' are
plum A plum is a fruit of some species in Prunus subg. Prunus, ''Prunus'' subg. ''Prunus'.'' Dried plums are often called prunes, though in the United States they may be labeled as 'dried plums', especially during the 21st century. Plums are ...
s,
peach The peach (''Prunus persica'') is a deciduous tree first domesticated and Agriculture, cultivated in China. It bears edible juicy fruits with various characteristics, most called peaches and the glossy-skinned, non-fuzzy varieties called necta ...
es,
apricot An apricot (, ) is a fruit, or the tree that bears the fruit, of several species in the genus ''Prunus''. Usually an apricot is from the species '' P. armeniaca'', but the fruits of the other species in ''Prunus'' sect. ''Armeniaca'' are also ...
s, and
almond The almond (''Prunus amygdalus'', Synonym (taxonomy)#Botany, syn. ''Prunus dulcis'') is a species of tree from the genus ''Prunus''. Along with the peach, it is classified in the subgenus ''Amygdalus'', distinguished from the other subgenera ...
s). ''Cerasus'' was originally named as a
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
in 1700 by de Tournefort. In 1753,
Linnaeus Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné,#Blunt, Blunt (2004), p. 171. was a Swedish biologist and physician who formalised binomial nomenclature, the modern system of naming o ...
combined it with several other groupings to form a larger ''Prunus'' genus. ''Cerasus'' was later converted into a
section Section, Sectioning, or Sectioned may refer to: Arts, entertainment and media * Section (music), a complete, but not independent, musical idea * Section (typography), a subdivision, especially of a chapter, in books and documents ** Section sig ...
and then a
subgenus In biology, a subgenus ( subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the ge ...
, this system becoming widely accepted, but some botanists resurrected it as a genus instead. In China and Russia, where there are many more wild cherry species than in Europe, ''Cerasus'' continues to be used as a genus. In Japan, ornamental cherry trees were traditionally classified in the genus ''Prunus'', as in Europe and North America, but after a 1992 paper by Hideaki Ohba of the University of Tokyo, classification in the genus ''Cerasus'' became more common. This means that (for example) the
scientific name In Taxonomy (biology), taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin gramm ...
''Cerasus incisa'' is now used in Japan instead of ''
Prunus incisa ''Prunus incisa'', the Fuji cherry, is a species of flowering plant in the family Rosaceae, which gets its scientific name from the deep incisions on the leaves. It is an endemic species in Japan and grows wild in Kantō, Chūbu and Kinki regio ...
''. A culture of
plum blossom ''Prunus mume'', the Chinese plum or Japanese apricot, is a tree species in the family Rosaceae. Along with bamboo, the plant is intimately associated with art, literature, and everyday life in China, from where it was then introduced to Kor ...
viewing has existed in mainland China since ancient times, and although cherry trees have many wild species, most of them had small flowers, and the distribution of wild cherry trees with large flowers suitable for cherry blossom viewing was limited. In Europe and North America, there were few cherry species with characteristics suitable for cherry blossom viewing. In Japan, on the other hand, the ''Prunus speciosa'' (Oshima cherry) and , which have large flowers suitable for cherry blossom viewing and tend to grow into large trees, were distributed over a fairly large area of the country and were close to people's living areas. The development of cherry blossom viewing, and the production of cultivars, is therefore considered to have taken place primarily in Japan. Because cherry trees have mutable traits, many
cultivar A cultivar is a kind of Horticulture, cultivated plant that people have selected for desired phenotypic trait, traits and which retains those traits when Plant propagation, propagated. Methods used to propagate cultivars include division, root a ...
s have been created for cherry blossom viewing, especially in Japan. Since the
Heian period The is the last division of classical Japanese history, running from 794 to 1185. It followed the Nara period, beginning when the 50th emperor, Emperor Kammu, moved the capital of Japan to Heian-kyō (modern Kyoto). means in Japanese. It is a ...
, the Japanese have produced cultivars by selecting superior or mutant trees from among the natural crossings of wild cherry trees. They were also produced by crossing trees artificially and then breeding them by
grafting Grafting or graftage is a horticulture, horticultural technique whereby tissues of plants are joined so as to continue their growth together. The upper part of the combined plant is called the scion () while the lower part is called the roots ...
and
cutting Cutting is the separation or opening of a physical object, into two or more portions, through the application of an acutely directed force. Implements commonly used for wikt:cut, cutting are the knife and saw, or in medicine and science the sca ...
. Oshima, Yamazakura, ''Prunus pendula'' f. ''ascendens'' (syn, ''Prunus itosakura'', Edo higan), and other varieties which grow naturally in Japan, mutate easily. The Oshima cherry, which is an
endemic species Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
in Japan, tends to mutate into a
double-flowered "Double-flowered" describes varieties of flowers with extra petals, often containing flowers within flowers. The double-flowered trait is often noted alongside the scientific name with the abbreviation ''fl. pl.'' (''flore pleno'', a Latin ablati ...
tree, grows quickly, has many large flowers, and has a strong fragrance. Due to these favorable characteristics, the Oshima cherry has been used as a base for many Sakura cultivars (called the Sato-zakura Group). Two such cultivars are the Yoshino cherry and Kanzan; Yoshino cherries are actively planted in Asian countries, and Kanzan is actively planted in Western countries.


''Hanami'': Flower viewing in Japan

is the many centuries-old practice of holding feasts or parties under blooming ( or ; or ) or (; ) trees. During the
Nara period The of the history of Japan covers the years from 710 to 794. Empress Genmei established the capital of Heijō-kyō (present-day Nara). Except for a five-year period (740–745), when the capital was briefly moved again, it remained the capita ...
(710–794), when the custom is said to have begun, it was blossoms that people admired. By the
Heian period The is the last division of classical Japanese history, running from 794 to 1185. It followed the Nara period, beginning when the 50th emperor, Emperor Kammu, moved the capital of Japan to Heian-kyō (modern Kyoto). means in Japanese. It is a ...
(794–1185), however, cherry blossoms were attracting more attention, and was synonymous with . From then on, in both and
haiku is a type of short form poetry that originated in Japan. Traditional Japanese haiku consist of three phrases composed of 17 Mora (linguistics), morae (called ''On (Japanese prosody), on'' in Japanese) in a 5, 7, 5 pattern; that include a ''kire ...
, meant "cherry blossoms," as implied by one of
Izumi Shikibu was a mid-Heian period Japanese people, Japanese poet. She is a member of the . She was the contemporary of Murasaki Shikibu, and Akazome Emon at the court of empress Empress Shōshi, Joto Mon'in. She "is considered by many to have been the gr ...
's poems. The custom was originally limited to the elite of the Imperial Court but soon spread to
samurai The samurai () were members of the warrior class in Japan. They were originally provincial warriors who came from wealthy landowning families who could afford to train their men to be mounted archers. In the 8th century AD, the imperial court d ...
society and, by the Edo period, to the common people as well. Tokugawa Yoshimune planted areas of cherry blossom trees to encourage this. Under the trees, people held cheerful feasts where they ate, and drank . Since a book written in the Heian period mentions , one of the cultivars with pendulous branches, Prunus itosakura, ''Prunus itosakura'' 'Pendula' (Sidare-zakura) is considered the oldest cultivar in Japan. In the Kamakura period, when the population increased in the southern Kantō region, the Oshima cherry, which originated in Izu Oshima Island, was brought to Honshu and cultivated there; it then made its way to the capital, Kyoto. The Sato-zakura Group first appeared during the Muromachi period. Prunus itosakura, ''Prunus itosakura'' (syn. ''Prunus subhirtella'', Edo higan) is a wild species that grows slowly. However, it has the longest life span among cherry trees and is easy to grow into large trees. For this reason, there are many large, old specimens of this species in Japan. They are often regarded as sacred and have become landmarks that symbolize Shinto shrines, Buddhist temples, and local areas. For example, '','' which is around 2,000 years old, '','' which is around 1,500 years old, and '','' which is around 1,000 years old, are famous for their age. In the Edo period, various
double-flowered "Double-flowered" describes varieties of flowers with extra petals, often containing flowers within flowers. The double-flowered trait is often noted alongside the scientific name with the abbreviation ''fl. pl.'' (''flore pleno'', a Latin ablati ...
cultivars were produced and planted on the banks of rivers, in Buddhist temples, in Shinto shrines, and in daimyo gardens in urban areas such as Edo; the common people living in urban areas could enjoy them. Books from the period record more than 200 varieties of cherry blossoms and mention many varieties that are currently known, such as Prunus 'Kanzan', 'Kanzan'. However, this situation was limited to urban areas, and the main objects of hanami across the country were still wild species such as and Oshima cherry. Since Japan was modernized in the Meiji era, Meiji period, the Yoshino cherry has spread throughout Japan, and it has become the main object of hanami. Various other cultivars were cut down one after another during changes related to the rapid modernization of cities, such as the reclamation of waterways and the demolition of daimyo gardens. The gardener Takagi Magoemon and the village mayor of Kohoku Village, Shimizu Kengo, were concerned about this situation and preserved a few by planting a row of cherry trees, of various cultivars, along the Arakawa River (Kantō), Arakawa River bank. In Kyoto, Sano Toemon XIV, a gardener, collected various cultivars and propagated them. After World War II, these cultivars were inherited by the National Institute of Genetics, Tama Forest Science Garden and the Flower Association of Japan, and from the 1960s onwards were again used for hanami. Every year, the Japan Meteorological Agency, Japanese Meteorological Agency (JMA) and the public track the as it moves northward up the archipelago with the approach of warmer weather, via nightly forecasts following the weather segment of news programs. Since 2009, tracking of the ''sakura zensen'' has been largely taken over by private forecasting companies, with the JMA switching to focus only on data collection that than forecasting. The blossoming begins in Okinawa Prefecture, Okinawa in January and typically reaches Kyoto and Tokyo at the beginning of April, though recent years have trended towards earlier flowerings near the end of March. It proceeds northward and into areas of higher altitude, arriving in Hokkaido a few weeks later. Japanese locals, in addition to overseas tourists, pay close attention to these forecasts. Most Japanese schools and public buildings have cherry blossom trees planted outside of them. Since the fiscal and school years both begin in April, in many parts of Honshu the first day of work or school coincides with the cherry blossom season. However, while most cherry blossom trees bloom in the spring, there are also lesser-known winter cherry blossoms (''fuyuzakura'' in Japanese) that bloom between October and December. The Japan Cherry Blossom Association has published a list of Japan's Top 100 Cherry Blossom Spots (), with at least one location in every prefecture.


Blooming season

Many cherry species and cultivars bloom between March and April in the Northern Hemisphere. Wild cherry trees, even if they are the same species, differ genetically from one individual to another. Even if they are planted in the same area, there is some variation in the time when they reach full bloom. In contrast, cultivars are clones propagated by grafting or cutting, so each tree of the same cultivar planted in the same area will come into full bloom all at once due to their genetic similarity. Some wild species, such as Prunus itosakura, Edo higan and the cultivars developed from them, are in full bloom before the leaves open. Yoshino cherry became popular for cherry-blossom viewing because of these characteristics of simultaneous flowering and blooming before the leaves open; it also bears many flowers and grows into a large tree. Many cultivars of the Prunus serrulata, Sato-zakura group, which were developed from complex interspecific hybrids based on Oshima cherry, are often used for ornamental purposes. They generally reach full bloom a few days to two weeks after Yoshino cherry does.


Impacts of climate change

The flowering time of cherry trees is thought to be affected by global warming and the heat island effect of urbanization. According to the record of full bloom dates of in Kyoto, Japan, which has been recorded for about 1200 years, the time of full bloom was relatively stable from 812 to the 1800s. After that, the time of full color rapidly became earlier, and in 2021, the earliest full bloom date in 1200 years was recorded. The average peak bloom day in the 1850s was around April 17, but by the 2020s, it was April 5; the average temperature rose by about during this time. According to the record of full bloom dates of the Yoshino cherry in the Tidal Basin in Washington, D.C., the bloom date was April 5 in 1921, but it was March 31 in 2021. These records are consistent with the history of rapid increases in global mean temperature since the mid-1800s. Japanese cherry trees grown in the Southern Hemisphere will bloom at a different time of the year. For example, in Australia, while the trees in the Cowra Japanese Garden and Cultural Centre, Cowra Japanese Garden bloom in late September to mid-October, the Sydney cherry blossom festival is in late August. There's an escalating concern of climate change as it poses a threat to sakura cultivars, given that they are highly susceptible to shifts in temperature and weather fluctuations. The changes, driven by climate change including warmer temperatures and earlier starts to springtime, may disrupt the timing of their blooms and potentially lead to reduced flowering and cultural significance. In 2023, it has been observed in China that cherry blossoms have reached their peak bloom weeks earlier than they previously had a few decades ago. Similarly, data from Kyoto, Japan, and Washington, D.C., United States, also indicated that blooming periods are occurring earlier in those locations as well. Although precise forecasting is generally challenging, AI predictions from Japan Meteorological Agency, have suggested that without substantial efforts to rein in climate change, the Somei-Yoshino cherry tree variety could face significant challenges and even the risk of disappearing entirely from certain parts of Japan, including Miyazaki, Nagasaki, and Kagoshima prefectures in the Kyushu region by 2100.


Symbolism in Japan

Cherry blossoms are a frequent topic in ''Waka (poetry), waka'' composition, where they commonly symbolize impermanence. Due to their characteristic of blooming ', cherry blossoms and are considered an enduring metaphor for the ephemeral nature of life. Cherry blossoms frequently appear in Japanese art, manga, anime, and film, as well as stage set designs for musical performances. There is at least one popular folk song, originally meant for the shakuhachi (bamboo flute), titled "Sakura (folk song), Sakura", in addition to several later j-pop, pop songs bearing the name. The flower is also used on all manner of historical and contemporary consumer goods, including kimonos, stationery, and dishware.


''Mono no aware''

The traditional symbolism of cherry blossoms as a metaphor for the ephemeral nature of life is associated with the influence of Shinto, embodied in the concept of (the pathos of things). The connection between cherry blossoms and ''mono no aware'' dates back to 18th-century scholar Motoori Norinaga. The transience of the blossoms, their beauty, and their volatility have often been associated with mortality and the graceful and ready acceptance of destiny and karma.


Nationalism and militarism

The ''Sakurakai,'' or Cherry Blossom Society, was the name chosen by young officers within the Imperial Japanese Army in September 1930 for their secret society established to reorganize the state along totalitarian militaristic lines, via a military coup d'état if necessary. During World War II, cherry blossoms were used as a symbol to motivate the Japanese people and stoke nationalism and militarism. The Japanese proverb ''hana wa sakuragi, hito wa bushi'' ("the best blossom is the cherry blossom, the best man is a warrior") was evoked in the Imperial Japanese Armed Forces, Imperial Japanese Army as a motivation during the war. Even before the war, cherry blossoms were used in propaganda to inspire the "Japanese spirit", as in the "Song of Young Japan", exulting in "warriors" who were "ready like the myriad cherry blossoms to scatter". In 1894, Nobutsuna Sasaki, Sasaki Nobutsuna composed a poem,
Shina seibatsu no uta
' (The Song of the Conquest of the Chinese) to coincide with the First Sino-Japanese War. The poem compares falling cherry blossoms to the sacrifice of Japanese soldiers who fall in battles for their country and emperor. In 1932, Akiko Yosano's poetry urged Japanese soldiers to endure suffering in China and compared the dead soldiers to cherry blossoms. Arguments that the plans for the Battle of Leyte Gulf, involving all Japanese ships, would expose Japan to danger if they failed were countered with the plea that the Navy be permitted to "bloom as flowers of death". The last message of the forces on Battle of Peleliu, Peleliu was "Sakura, Sakura". Japanese pilots would paint sakura flowers on the sides of their planes before embarking on a suicide mission, or even take branches of the trees with them on their missions. A cherry blossom painted on the side of a bomber symbolized the intensity and ephemerality of life; in this way, falling cherry petals came to represent the sacrifice of youth in suicide missions to honor the emperor. The first kamikaze unit had a subunit called ''Yamazakura'', or wild cherry blossom. The Japanese government encouraged the people to believe that the souls of downed warriors were reincarnated in the blossoms.


Artistic and popular uses

Cherry blossoms have been used symbolically in Japanese sports; the Japan national rugby union team has used the flower as an emblem on its uniforms since the team's first international matches in the 1930s, depicted as a "bud, half-open and full-bloomed". The team is known as the "Brave Blossoms" (), and has had their current logo since 1952. The cherry blossom is also seen in the logo of the Japan Cricket Association and the Japan national American football team. Cherry blossoms are a prevalent symbol in ''irezumi'', the traditional art of Japanese tattoos. In this art form, cherry blossoms are often combined with other classic Japanese symbols like Koi, koi fish, dragons, or tigers. The cherry blossom remains symbolic today. It was used for the 2020 Summer Paralympics, Tokyo 2020 Paralympics mascot, Miraitowa and Someity, Someity. It is also a common way to indicate the start of spring, such as in the ''Animal Crossing'' series of video games, where many of the game's trees are flowering cherries.


Cultivars

Japan has a wide diversity of cherry trees, including hundreds of
cultivar A cultivar is a kind of Horticulture, cultivated plant that people have selected for desired phenotypic trait, traits and which retains those traits when Plant propagation, propagated. Methods used to propagate cultivars include division, root a ...
s. By one classification method, there are more than 600 cultivars in Japan, while the Tokyo Shimbun claims that there are 800. According to the results of DNA analysis of 215 cultivars carried out by Japan's Forestry and Forest Products Research Institute in 2014, many of the cultivars that have spread around the world are hybrids produced by crossing Prunus speciosa, Oshima cherry and with various wild species. Among these cultivars, the Sato-zakura Group and many other cultivars have a large number of petals, and the representative cultivar is Prunus 'Kanzan', ''Prunus serrulata'' 'Kanzan'. The following species, hybrids, and
varieties Variety may refer to: Arts and entertainment Entertainment formats * Variety (radio) * Variety show, in theater and television Films * ''Variety'' (1925 film), a German silent film directed by Ewald Andre Dupont * ''Variety'' (1935 film), ...
are used for ''Sakura'' cultivars: * ''Prunus apetala (Clove Cherry)'' * ''Prunus campanulata'' * ''Prunus × furuseana'' (''P. incisa'' × ''P. jamasakura'') * ''Prunus × incam'' (''P. incisa'' × ''P. campanulata'') * ''
Prunus incisa ''Prunus incisa'', the Fuji cherry, is a species of flowering plant in the family Rosaceae, which gets its scientific name from the deep incisions on the leaves. It is an endemic species in Japan and grows wild in Kantō, Chūbu and Kinki regio ...
'' var. ''incisa'' * ''Prunus incisa'' var. ''kinkiensis'' * ''Prunus × introrsa'' * ''Prunus itosakura'' (''Prunus subhirtella'', ''Prunus pendula'') * ' * ''Prunus × kanzakura'' (''P. campanulata'' × ''P. jamasakura'' and ''P. campanulata'' × ''P. speciosa'') * ''Prunus leveilleana'' (''Prunus verecunda'') * ''Prunus × miyoshii'' * ''Prunus nipponica'' * ''Prunus padus'' * ''Prunus × parvifolia'' (''P. incisa'' × ''P. speciosa'') * ''Prunus pseudocerasus'' * ''Prunus × sacra'' (''P. itosakura'' × ''P. jamasakura'') * ''Prunus sargentii'' * ''Prunus serrulata#Cultivars, Prunus serrulata var. lannesiana, Prunus lannesiana'' (''Prunus'' Sato-zakura group. Complex interspecific hybrids based on ''Prunus speciosa''.) * ''Prunus × sieboldii'' * ''Prunus speciosa'' * ''Prunus × subhirtella'' (''P. incisa'' × ''P. itosakura'') * ''Prunus × syodoi'' * ''Prunus × tajimensis'' * ''Prunus × takenakae'' * ''Prunus × yedoensis'' (''P. itosakura'' × ''P. speciosa'') The most popular cherry blossom cultivar in Japan is Prunus × yedoensis, 'Somei-yoshino' (Yoshino cherry). Its flowers are nearly pure white, tinged with the palest pink, especially near the stem. They bloom and usually fall within a week before the leaves come out. Therefore, the trees look nearly white from top to bottom. The cultivar takes its name from the village of Somei, which is now part of Toshima, Tokyo (ward), Toshima in Tokyo. It was developed in the mid- to late-19th century, at the end of the Edo period and the beginning of the Meiji era, Meiji period. The 'Somei-yoshino' is so widely associated with cherry blossoms that ''jidaigeki'' and other works of fiction often show the trees being cultivated in the Edo period or earlier, although such depictions are anachronisms. is a representative cultivar that blooms before the arrival of spring. It is a natural hybrid between the Oshima cherry and ''Prunus campanulata'' and is characterized by deep pink petals. Wild cherry trees usually do not bloom in cold seasons because they cannot produce offspring if they bloom before spring, when pollinating insects become active. However, it is thought that 'Kawazu-zakura' blooms earlier because ''Prunus campanulata'' from Okinawa Prefecture, Okinawa, which did not originally grow naturally in Honshu, was crossed with the Oshima cherry. In wild species, flowering before spring is a disadvantageous feature of selection; in cultivars such as 'Kawazu-zakura', early flowering and flower characteristics are preferred, and they are propagated by grafting. Cherry trees are generally classified by species and cultivar, but in Japan they are also classified using names based on the characteristics of the flowers and trees. Cherry trees with more petals than the ordinary five are classified as ''yae-zakura'' (
double-flowered "Double-flowered" describes varieties of flowers with extra petals, often containing flowers within flowers. The double-flowered trait is often noted alongside the scientific name with the abbreviation ''fl. pl.'' (''flore pleno'', a Latin ablati ...
sakura), and those with drooping branches are classified as ''shidare-zakura'', or weeping cherry. Most ''yae-zakura'' and ''shidare-zakura'' are cultivars. Famous ''shidare-zakura'' cultivars include 'Prunus itosakura, Shidare-zakura', 'Prunus itosakura, Beni-shidare', and 'Prunus itosakura, Yae-beni-shidare', all derived from the wild species ''Prunus itosakura, Prunus itosakura (syn, ''Prunus subhirtella'' or Edo higan)''. The color of cherry blossoms is generally a gradation between white and red, but there are cultivars with unusual colors such as yellow and green. The representative cultivars of these colors are and , which were developed in the Edo period of Japan. In 2007, Riken produced a new cultivar named 'Nishina zao' by irradiating cherry trees with a ion beam, heavy-ion beam. This cultivar is a Mutation breeding, mutation of the green-petaled ; it is characterized by its pale yellow-green-white flowers when it blooms and pale yellow-pink flowers when they fall. Riken produced the cultivars 'Nishina otome' (blooms in both spring and autumn, or year-round in a greenhouse), 'Nishina haruka' (larger flowers), and 'Nishina komachi' ('lantern-like' flowers that remain partially closed) in the same way. All wild cherry trees produce small, unpalatable fruit or edible Cherry, cherries, however, some cultivars have structural modifications to render the plant unable to naturally reproduce. For example, and , which originated from the Oshima cherry, have a modified pistil that develops into a leaf-like structure, and can only be propagated by artificial methods such as grafting and cutting. Cherry trees grown for their fruit are generally cultivars of the related species ''Prunus avium'', ''Prunus cerasus'', and ''Prunus fruticosa''.


Cultivation by country

In the present day, ornamental cherry blossom trees are distributed and cultivated worldwide. While flowering cherry trees were historically present in Europe, North America, Philippines, and China, the practice of cultivating ornamental cherry trees was centered in Japan, and many of the
cultivar A cultivar is a kind of Horticulture, cultivated plant that people have selected for desired phenotypic trait, traits and which retains those traits when Plant propagation, propagated. Methods used to propagate cultivars include division, root a ...
s planted worldwide, such as that of ''Prunus × yedoensis'',Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins . have been developed from Japanese hybrids. The global distribution of ornamental cherry trees, along with flower viewing festivals or ''
hanami is the Japanese traditional custom of enjoying the transient beauty of flowers; in this case almost always mean those of the or, less frequently, trees. From the end of March to early May, cherry trees bloom all over Japan, and around the s ...
'', largely started in the early 20th century, often as gifts from Japan. However, some regions have historically cultivated their own native species of flowering cherry trees, a notable variety of which is the Himalayan wild cherry tree ''Prunus cerasoides''.


The origin of wild cherry species

The wild Himalayan cherry, ''Prunus cerasoides'', is native to the Himalayan region of Asia, and is common in countries such as Nepal, India, Bhutan, and Myanmar, where it is also cultivated. In 1975, three Japanese researchers proposed a theory that cherry trees originated in the Himalayan region and spread eastwards to reach Japan at a time before human civilisation, when the Japanese archipelago was connected to the Eurasian continent, and that cherry species differentiation was actively promoted in Japan. According to Masataka Somego, a professor at Tokyo University of Agriculture, cherry trees originated 10 million years ago in what is now Nepal and later differentiated in the Japanese archipelago, giving rise to species unique to Japan. According to the Kazusa DNA Research Institute, detailed DNA research has shown that the ''Prunus itosakura'' and the ''Prunus speciosa'', which is endemic to Japan, differentiated into independent species 5.52 million years ago. On the other hand, according to Ko Shimamoto, a professor at Nara Institute of Science and Technology, modern theories based on detailed DNA research reject the theory that the Himalayan cherry tree is the root of the Japanese cherry tree, and the ancestor of the cherry tree is estimated to be a plant belonging to the ''Prunus grayana''. According to HuffPost, it is a widely held consensus that the origin of the first cherry blossoms happened somewhere in the Himalayas, Eurasia but scholars posit that the blossoms may have reached Japan around several thousand years ago. In Japan, centuries of hybridization have brought about more than 300 varieties of the cherry blossom.


Culinary use

Cherry blossoms and leaves are edible, and both are used as food ingredients in Japan: * The blossoms are pickled in salt and Umeboshi, umezu (ume vinegar), and used for coaxing out flavor in wagashi, a traditional Japanese confectionery, or anpan, a Japanese sweet bun most-commonly filled with red bean paste. The pickling method, known as , is said to date back to the end of the Edo period, though the general method of pickling vegetables in salt to produce ''tsukemono'' has been known as early as the Jōmon period. * Salt-pickled blossoms in hot water are called sakurayu and drunk at festive events like weddings in place of green tea. * The Leaf, leaves are pickled in salted water and used for sakuramochi. "A traditional Japanese sweet confection (sakura-mochi) consists of a ball of sweet, glutinous rice wrapped in a salt-pickled cherry leaf. Even if one does not want to eat the leaf, one will still experience a cherry taste as it seeps into the rice." * Cherry blossoms are used as a flavoring botanical in Japanese Roku gin.


Toxicity

Cherry leaves and blossoms contain
coumarin Coumarin () or 2''H''-chromen-2-one is an aromatic organic chemical compound with formula . Its molecule can be described as a benzene molecule with two adjacent hydrogen atoms replaced by an unsaturated lactone ring , forming a second six-me ...
, which is potentially Hepatotoxicity, hepatotoxic and is banned in high doses by the Food and Drug Administration. However, coumarin has a desirable vanilla-like scent, and the salt curing process used prior to most culinary applications, which involves washing, drying, and salting the blossoms or leaves for a full day, reduces the concentration of coumarin to acceptable levels while preserving its scent. Coumarin may also be isolated from the plant for use in perfumes, pipe tobacco, or as an adulterant in vanilla flavorings, though the tonka bean is a more common natural source of this chemical. Cherry seeds and bark contain amygdalin and should not be eaten.


See also


Notes


References


Sources

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External links


Japanese Cherry Blossom Guide

Japanese Cherry Blossom Events & Locations

Copenhagen Sakura Festival

Flowering cherry Database
��Forestry and Forest Products Research Institute

��Forestry and Forest Products Research Institute
International Cherry Blossom Festival Online
��Information about the 300,000 Yoshino cherry trees in Macon, Georgia, and the 10-day celebration held in mid-March
Vancouver Cherry Blossom Festival
��Information about the 37,000 cherry trees in Greater Vancouver (Canada), What's in bloom now, Cherry Scout reports and maps, Cultivar identification.
Subaru Cherry Blossom Festival of Greater Philadelphia
(()—Information about cherry trees and the annual two-week Subaru Cherry Blossom Festival of Greater Philadelphia.
Cherry Blossoms Celebration in Japan

Cherry Blossoms Celebration Tourism Office Valle del Jerte in Spain
{{Authority control Cherry blossom, Cherries Flora of Japan Flowers Garden plants of Asia National symbols of Japan Ornamental trees Plants used in bonsai Prunus Spring (season) Trees of Japan fi:Kirsikat