Allium caeruleum Pall.
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Allium caeruleum, commonly known as blue allium, belongs to the group of bulbous and tuberous plants.
Allium caeruleum was described by Peter Simon von Pallas in 1773. The name is considered as validly published.
Allium caeruleum 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 60 centimetres.
Allium caeruleum is deciduous. The dark-green, simple leaves are basal. They are linear with entire margins and parallel venation.
Flowers and Fruits
Allium caeruleum produces umbels of light-blue six-stellate flowers from June to July.
The plants carry ornamental loculicidal capsules.
Allium caeruleum is native to eastern European Russia, West-Siberia, Central Asia and China.
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 -18Â°C (USDA zone 7).
Classification after Prof. Dr. Sieber
- flower beds (rich soil)
- open areas
The recommended planting distance is 20 centimetres, the plants are best planted in groups of 5 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.
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.