Bidens tripartita L.
Bidens tripartita, commonly known as marigold burr, trifid bur marigold, belongs to the group of annual and biennial plants.
Bidens tripartita was described by Carl Linnaeus in 1753. The name is considered as validly published.
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.
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.
Bidens tripartita is native to the whole of Europe, Turkey, western Asia, North Africa and North America.
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 -23Â°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
The ornamental value of Bidens tripartita lies especially in the attractive autumn aspect.
Maintenance and Propagation
Propagate by sowing.
Pests and Diseases
- Walter Erhardt, Erich GÃ¶tz, Nils BÃ¶deker, Siegmund Seybold: Der groÃe 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.