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Cherry blossom

life science Maturity 5-7 Next article →

Cherry blossoms, known as sakura, are the flowers of trees within the Prunus subgenus Cerasus.

Sakura and Moss Pink - 桜(さくら)と芝桜(しばざくら)
Sakura and Moss Pink - 桜(さくら)と芝桜(しばざくら)

While many wild species are distributed across the Northern Hemisphere, they are most common in East Asia. In Japan, these trees have been cultivated for centuries to create many different varieties. Most ornamental cherry trees found in parks are cultivars. A cultivar is a plant variety produced by human selection for specific traits, such as appearance. These flowers are often described as having a vanilla-like scent. This fragrance is primarily attributed to a chemical compound called coumarin.

Creating these specific varieties is a precise biological process. To develop a suitable cultivar, gardeners look for wild species with desirable characteristics. One essential species is Prunus speciosa, also known as the Oshima cherry. This tree is endemic to Japan, meaning it is found nowhere else naturally. It produces many large, fragrant flowers and grows very rapidly. Furthermore, it easily undergoes mutation to produce double flowers.

Prunus speciosa in the Jardin des Plantes 002
Prunus speciosa in the Jardin des Plantes 002

Since the 14th century, these traits have helped produce the Cerasus Sato-zakura Group. In modern times, most cultivars are propagated through grafting. Grafting is a method where parts of one tree are joined to another. This technique quickly produces new trees with the exact same genetic characteristics as the parent plant.

Scientists use a complex system to classify these trees. Classification can be difficult because cherry trees are prone to mutation. They possess many different varieties, hybrids, and cultivars. In Europe and North America, ornamental cherries are classified under the subgenus Cerasus, which contains about 100 species. This subgenus is part of the larger Prunus genus. It is important to note that Cerasus does not include bush cherries or cherry laurels. The history of this naming is long. De Tournefort named Cerasus as a genus in 1700. Later, Linnaeus combined it into the Prunus genus in 1753. Today, the use of Cerasus varies by region. While some use it as a subgenus, researchers in China and Russia often use it as a genus. In Japan, a 1992 paper by Hideaki Ohba helped make the Cerasus classification more common.

The cultural tradition of viewing these blossoms is called hanami.

Cherry-Blossom-Utagawa-Hiroshige-36-Views-of-Mount Fuji-Series-7
Cherry-Blossom-Utagawa-Hiroshige-36-Views-of-Mount Fuji-Series-7

This practice involves holding feasts or parties under blooming trees. The custom is said to have begun during the Nara period from 710 to 794. During the Heian period, cherry blossoms became more important than plum blossoms. The word sakura became synonymous with the season itself. Originally, hanami was a custom for the elite at the Imperial Court. It later spread to the samurai class and eventually to common people. During the Edo period, the leader Tokugawa Yoshimune planted cherry trees to encourage public enjoyment. People gather under the branches to eat and drink during these cheerful celebrations.

Some cherry trees are remarkable for their extreme age and size. The species Prunus itosakura grows slowly but has a very long life span. Because of this, many large, old specimens exist in Japan. These ancient trees are often regarded as sacred landmarks. They frequently symbolize Shinto shrines or Buddhist temples.

Hokuto Yamanashi Yamatakajindaizakura 1
Hokuto Yamanashi Yamatakajindaizakura 1

Some famous examples include a tree that is approximately 2,000 years old. Other notable specimens are around 1,500 and 1,000 years old. These trees serve as living connections to Japan's distant past.

Cherry blossom cultivation eventually spread globally. In 1912, Japan presented cherry trees to the United States as a token of friendship. This helped the cultivation of ornamental cherries spread to Europe and North America. After the First World War, the British plant collector Collingwood Ingram conducted important studies on these Japanese trees.

カンザン全体
カンザン全体

Today, different cultivars are popular in different parts of the world. For example, the Yoshino cherry is actively planted in many Asian countries. In contrast, the Kanzan cultivar is widely planted in Western nations.

Modern challenges are currently changing how Japan manages its sakura.

Yoshino cherry ソメイヨシノ 3
Yoshino cherry ソメイヨシノ 3

The popular Yoshino cherry is facing several problems. It is susceptible to a condition called Witch's broom disease. Additionally, its large root systems can damage urban pavement. Because of these issues, many cities are replacing Yoshino trees with new cultivars. One alternative is 'Jindai-akebono', which is more resistant to disease and stays smaller. Another is 'Yoko', which was developed in Ehime Prefecture in 1981. These new trees feature large, deep pink flowers. Scientists and the public also track the sakura zensen, or the bloom front. This front moves northward as the weather warms. The blossoms usually start in Okinawa in January and reach Tokyo by early April. This movement is tracked closely by the public and private forecasting companies every year.

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🖼️ Images & Media (17)
File:Sakura and Moss Pink - 桜(さくら)と芝桜(しばざくら).jpg
Sakura and Moss Pink - 桜(さくら)と芝桜(しばざくら).jpg
File:Prunus speciosa in the Jardin des Plantes 002.jpg
Prunus speciosa in the Jardin des Plantes 002.jpg
File:カンザン全体.jpg
カンザン全体.jpg
File:Cherry-Blossom-Utagawa-Hiroshige-36-Views-of-Mount Fuji-Series-7.jpg
Cherry-Blossom-Utagawa-Hiroshige-36-Views-...
File:Hokuto Yamanashi Yamatakajindaizakura 1.JPG
Hokuto Yamanashi Yamatakajindaizakura 1.JPG
File:Prunus 'Jindai Akebono' 小江川1000本桜4.jpg
Prunus 'Jindai Akebono' 小江川1000本桜4.jpg
File:Prunus 'Yoko' いまい台の陽光桜並木2.jpg
Prunus 'Yoko' いまい台の陽光桜並木2.jpg
File:Yoshino cherry ソメイヨシノ 3.jpg
Yoshino cherry ソメイヨシノ 3.jpg
File:100JPY.JPG
100JPY.JPG
File:Summer Nations Series '23- Italia vs Giappone-45 (53148622315).jpg
Summer Nations Series '23- Italia vs...
File:Miharu Miharu-Takizakura Front 1.jpg
Miharu Miharu-Takizakura Front 1.jpg
File:Omoigawa, Hakuoh University.jpg
Omoigawa, Hakuoh University.jpg

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