Centaurea cyanus L.
Centaurea cyanus belongs to the group of annual and biennial plants.
Centaurea cyanus was described by Carl Linnaeus in 1753. The name is considered as validly published.
Centaurea cyanus is a species in the genus Centaurea which contains approximately 864 to 1486 species and belongs to the family of the Asteraceae (Aster Family). The type species of the genus is Centaurea paniculata.
The plants reach heights of 20 to 80 centimetres.
Centaurea cyanus is deciduous. The leaves are simple and green. They are lanceolate with entire margins.
Flowers and Fruits
Centaurea cyanus produces solitary blue many-stellate flowers from May to July.
The plants produce achenes.
Centaurea cyanus is native to Sicily and Malta and the Balkan Peninsula and is naturalized in the whole of Europe, the Caucasus, West-Siberia, East Siberia, Northwest Africa and North America.
The plants prefer a sunny situation on fresh to moist soil. The substrate should be sandy-loamy, gritty-loamy or sandy clay soil. They tolerate temperatures down to -45Â°C (USDA zone 2).
Classification after Prof. Dr. Sieber
- woodland borders (soil usually rich in humus)
Tolerance of special soil conditions
- none: drought
The recommended planting distance is 25 centimetres. Suited as cut flowers and as bee pasture.
Maintenance and Propagation
The plants usually need very little maintenance.
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.