Bidens tripartita

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Bidens tripartita L.

Asteraceae

Life form: annual or biennial

Exposure: half shade   6

Moisture: moist

Soil: sandy loam - Soil: gritty loam - Soil: sandy clay

Arrangement: opposite
Leaves: decidious

Shape: ovate

Division: simple

Shape: many-stellate
Fruit: achene

3D / efe981 

Inflorescence: solitary

Petals: not specified
Habit: not specified

Growth form: not specified

Taxonomy

Divisio:
Magnoliophyta
Subdivisio:
Magnoliophytina
Classis:
Rosopsida
Subclassis:
Asteridae
Superordo:
Asteranae
Ordo:
Asterales

Bidens tripartita, commonly known as marigold burr, trifid bur marigold, belongs to the group of annual and biennial plants.

Naming

Bidens tripartita was described by Carl Linnaeus in 1753. The name is considered as validly published.

Taxonomy

Bidens tripartita is the type species of the genus Bidens which contains approximately 276 to 334 species and belongs to the family of the Asteraceae (Aster Family).

Characteristics

Growth

The plants reach heights of 20 to 70 centimetres and are comparatively fast-growing and short-lived. They have a erect habit and produce a single stem, the main growing season is from spring to fall.

Leaves

Bidens tripartita is deciduous. The dark-green, simple leaves are opposite. They are ovate, serrate and petiolate. The foliage is porous.

Flowers and Fruits

Bidens tripartita produces solitary showy, ligth-yellow many-stellate flowers from July to September.

In autumn the plants produce an abundance of brown achenes that are persistent on the plant.

Root System

Distribution

Bidens tripartita is native to the whole of Europe, Turkey, western Asia, North Africa and North America.

Cultivation

The plants prefer a half-shady situation on moist soil. They prefer sandy-loamy, gritty-loamy or sandy clay soil with a pH between 5 and 7,2. The plants need a soil depth of at least 20 centimetres for good growth. They tolerate temperatures down to -23°C (USDA zone 6) and need a frost-free period of at least 14 weeks.

Tolerance of special soil conditions

  • none: soil salinity
  • low: drought
  • medium: anaerobic soil, calcareous soil

Uses

The ornamental value of Bidens tripartita lies especially in the attractive autumn aspect.

Maintenance and Propagation

Propagate by sowing.

Cultivars

Pests and Diseases

Literature

  • Walter Erhardt, Erich Götz, Nils Bödeker, Siegmund Seybold: Der große Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
  • Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.

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