Allium sphaerocephalon L.
- - - -
Allium sphaerocephalon, commonly known as round-headed leek, belongs to the group of bulbous and tuberous plants.
Allium sphaerocephalon was described by Carl Linnaeus in 1753. The name is considered as validly published.
Allium sphaerocephalon is a species in the genus Allium which contains approximately 943 to 1011 species and belongs to the family of the Alliaceae (Garlic Family). The type species of the genus is Allium sativum.
The plants reach heights of 50 to 90 centimetres.
Allium sphaerocephalon is deciduous. The yellow-green, simple leaves are basal. They are linear with entire margins and parallel venation.
Flowers and Fruits
Allium sphaerocephalon produces umbels of dark-red campanulate flowers from June to July.
The plants carry ornamental loculicidal capsules.
Allium sphaerocephalon is native to the whole of Europe with the exception of Sicily, Turkey, North Africa and the Caucasus.
The plants prefer a sunny situation on dry to moderately moist soil. The substrate should be sandy-loamy, gritty-loamy, sandy clay, loamy clay or peaty soil with a pH between 8 and 10. They tolerate temperatures down to -29Â°C (USDA zone 5).
Classification after Prof. Dr. Sieber
- flower beds (rich soil)
- open areas
- steppes/dry forests (usually calcareous soil)
Tolerance of special soil conditions
- none: drought
The recommended planting distance is 25 centimetres, the plants are best planted in groups of 5 to 10. Suited for roof greening, as well as suited as cut flowers and as bee pasture.
Maintenance and Propagation
The plants usually need very little maintenance.
- Cut back after flowering.
Propagate by sowing or by bulblets.
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.