Centaurea ruthenica Lam.
Centaurea ruthenica is a perennial.
Centaurea ruthenica was described by Jean-Baptiste Pierre Antoine de Monet de Lamarck in 1785. The name is considered as validly published.
Centaurea ruthenica 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 perennials have an upright growth and reach heights of 1 to 1,5 metres.
Centaurea ruthenica is deciduous. The leaves are simple and dark-green. They are ovate with pinnatisect margins.
Flowers and Fruits
Centaurea ruthenica produces solitary ligth-yellow many-stellate flowers from July to August.
The perennials produce achenes.
Centaurea ruthenica is native to Eastern Europe, the Caucasus, West-Siberia and Central Asia.
The perennials prefer a sunny situation on fresh to moist soil. The substrate should be sandy-loamy, gritty-loamy or sandy clay soil with a pH between 8 and 10. They tolerate temperatures down to -40Â°C (USDA zone 3).
Classification after Prof. Dr. Sieber
- woodland borders (soil usually rich in humus)
The recommended planting distance is 40 to 50 centimetres, the perennials are best planted in groups of 3 to 10. Suited as cut flowers and as bee pasture.
Maintenance and Propagation
The plants need little to no maintenance if grown under suitable conditions.
- Cut back faded flowering shoots.
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.