AskDefine | Define dahlias

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English

Noun

dahlias
  1. Plural of dahlia

Extensive Definition

Dahlia is a genus of bushy, tuberous, perennial plants native to Mexico, Central America, and Colombia. There at least 36 species of Dahlia. Dahlia hybrids are commonly grown as garden plants. The Aztecs gathered and cultivated the dahlia for food, ceremony, as well as decorative purposes , and the long woody stem of one variety was used for small pipes.
In 1872 a box of Dahlia roots were sent from Mexico to the Netherlands. Only one plant survived the trip, but produced spectacular red flowers with pointed petals. Nurserymen in Europe bred from this plant, which was named Dahlia juarezii with parents of Dahlias discovered earlier and these are the progenitors of all modern Dahlia hybrids. Ever since, plant breeders have been actively breeding Dahlias to produce thousands of cultivars, usually chosen for their stunning and brightly coloured flowers. Dahlia plants range in height from as low as 12" (30cm) to as tall as 6-8 feet (180-240cm). The flowers can be as small as 2" (5 cm) or up to a foot (30 cm) in diameter. The great variety results from Dahlias being octoploids (they have eight sets of homologous chromosomes, whereas most plants have only two).
Dahlias are used as food plants by the larvae of some Lepidoptera species including Angle Shades, Common Swift, Ghost Moth and Large Yellow Underwing.
The dahlia is named after Swedish 18th-century botanist Anders Dahl. Until recently they were also named in Germany as "georgine" by the botanist Carl Ludwig Willdenow, after the naturalist Johann Gottlieb Georgi of St. Petersburg.

cultivar

Dahlia 'Dahlstar Sunset Pink' is a miniature Dahlia cultivar with pink flowers that shade to yellow in the centre. Height and spread are 15 cm.

Bloom forms

The "American Dahlia Society" recognizes 19 distinct bloom forms:
  • Formal Decorative
  • Informal Decorative
  • Straight Cactus
  • Semi Cactus
  • Incurved Cactus
  • Laciniated
  • Ball
  • Mini Ball
  • Pom
  • Waterlilly
  • Stellar
  • Novelty Fully Double
  • Novelty Open Center
  • Anenome
  • Single
  • Collerette
  • Orchid
  • Mignon Single

Gallery

Here are some photos of dahlias:
image:ADELAIDEFONTANE.jpg|Dahlia 'Adelaide Fontane' image:AKITA.jpg|Dahlia 'Akita' image:APPLEBLOSSOM2.jpg| Dahlia 'Appleblossom' image:ARABIANIGHT.jpg|Dahlia 'Arabian Night' image:ARTDECO.jpg| Dahlia 'Art Deco' image:ASAHICHOHJI.jpg|Dahlia 'Asahi Chohji' image:ASPEN.jpg|Dahlia 'Aspen' image:AURORASKISS.jpg|Dahlia 'Aurora's Kiss'

References

See also

dahlias in Arabic: داليا (زهرة)
dahlias in Bulgarian: Далия
dahlias in Danish: Dahlia
dahlias in German: Dahlien
dahlias in Modern Greek (1453-): Ντάλια
dahlias in Spanish: Dahlia
dahlias in Esperanto: Dalio
dahlias in French: Dahlia
dahlias in Indonesian: Dahlia
dahlias in Italian: Dahlia
dahlias in Hebrew: דליה
dahlias in Georgian: გეორგინა
dahlias in Lithuanian: Jurginas
dahlias in Hungarian: Dália (virág)
dahlias in Dutch: Dahlia
dahlias in Japanese: ダリア
dahlias in Norwegian: Georginer
dahlias in Norwegian Nynorsk: Georgine
dahlias in Polish: Dalia (roślina)
dahlias in Portuguese: Dahlia
dahlias in Romanian: Dahlia
dahlias in Russian: Георгина
dahlias in Slovenian: Dalija
dahlias in Finnish: Daaliat
dahlias in Vietnamese: Thược dược
dahlias in Turkish: Yıldız çiçeği
dahlias in Urdu: ڈہلیا
dahlias in Samogitian: Jorgėns
dahlias in Chinese: 大麗菊
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