Alcea rosea L.
Alcea rosea is a perennial.
Alcea rosea was described by Carl Linnaeus in 1753. The name is considered as validly published.
The comparatively long-lived perennials have an upright growth and reach heights of 1,5 to 2,5 metres. The plants reach a width of 30 to 60 centimetres.
Alcea rosea is deciduous. The bluish green, simple leaves are alternate. They are palmately lobed and petiolate with dentate margins and palmate venation. The surface of the leaves is pilose.
Flowers and Fruits
Alcea rosea produces racemes of erect, pink funnel-shaped flowers from June to October. The plants are hermaphroditic.
The perennials produce schizocarps.
Alcea rosea is native to Southwest Asia and the Balkan Peninsula and is naturalized in the whole of Europe with the exception of Sicily.
The perennials prefer a sunny situation on moderately moist soil. The substrate should be sandy-loamy or gritty-loamy soil with a pH between 6,5 and 7,5. They tolerate temperatures down to -35Â°C (USDA zone 4).
Classification after Prof. Dr. Sieber
- flower beds (rich soil)
The recommended planting distance is 70 centimetres, the perennials are best planted in groups of 3 to 5. Suited for cottage gardens and for beds and borders, as well as suited as cut flowers and as bee pasture.
Maintenance and Propagation
Pests and Diseases
Brown, orange or yellowish pustules on shoots and on the leaves lower surfaces are very likely caused by a fungal infestation (rust). Remove affected parts and apply fungicide. Also improve ventilation and reduce humidity.
- 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.