Allium fistulosum L.
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Allium fistulosum, commonly known as Japanese bunching onion, Welsh onion, belongs to the group of bulbous and tuberous plants.
Allium fistulosum was described by Carl Linnaeus in 1753. The name is considered as validly published.
Allium fistulosum 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 are comparatively fast-growing and reach heights of 45 to 60 centimetres. The plants reach a width of 30 to 60 centimetres.
Allium fistulosum is deciduous. The mid-green, simple leaves are basal. They are linear with entire margins and parallel venation. The surface of the leaves is glabrous.
Flowers and Fruits
Allium fistulosum produces umbels of pink six-stellate flowers from June to August. The plants are hermaphroditic.
The plants carry brown loculicidal capsules.
Allium fistulosum is native to : garden origin.
The plants prefer a sunny to half-shady 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 6,5 and 7,5. They tolerate temperatures down to -29Â°C (USDA zone 5).
Classification after Prof. Dr. Sieber
- open areas
Tolerance of special soil conditions
- high: city climate
The ornamental value of Allium fistulosum lies especially in its fragrance. The recommended planting distance is 25 centimetres, the plants are best planted in groups of 3 to 10. Suited as bee pasture.
Maintenance and Propagation
The plants need little to no maintenance if grown under suitable conditions.
- Cut back before seeds ripen to prevent self-seeding.
Pests and Diseases
Sudden wilting and pale green discolouration indicate a fungal infection (phytophthora). Remove infected plants. Avoid by improving drainage and over-fertilization.
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.