Asarum caudatum Lindl.
Asarum caudatum is a perennial.
Asarum caudatum was described by John Lindley in 1831. The name is considered as validly published.
Asarum caudatum is a species in the genus Asarum which contains approximately 130 to 142 species and belongs to the family of the Aristolochiaceae (Birthwort Family). The type species of the genus is Asarum europaeum.
The comparatively slow-growing perennials have a prostrate growth and reach heights of 5 to 8 centimetres. The plants reach a width of 10 to 30 centimetres.
Asarum caudatum is evergreen. The dark-green, simple leaves are basal. They are cordate and petiolate with entire margins and palmate venation. The surface of the leaves is glabrous.
Flowers and Fruits
Asarum caudatum produces solitary brown six-stellate flowers in July. The plants are hermaphroditic.
The perennials produce brown fruits in summer.
The plants form tap roots.
Asarum caudatum is native to western Canada, the Northwest of the US, the Rocky Mountains and California.
The perennials prefer a half-shady to shady situation on moist soil. The substrate should have a pH between 4 and 6. They tolerate temperatures down to -18Â°C (USDA zone 7).
Classification after Prof. Dr. Sieber
- woodland borders (soil usually rich in humus)
- woods (soil usually rich in organic material)
The ornamental value of Asarum caudatum lies especially in its fragrance. The recommended planting distance is 25 centimetres, the perennials are best planted in groups of 5 to 15. Suited for rockeries and for beds and borders, as well as suited as groundcover.
Maintenance and Propagation
The plants need little to no maintenance if grown under suitable conditions.
Propagate by division.
Asarum caudatum is moderately toxic.
Please read the health issues note!
Pests and Diseases
Irregular swelling, so-called 'galls', may be caused by insects, mites, fungi or bacteria. Destroy affected parts. To prevent infection avoid injuring the plants and improve drainage.
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.
Gnaw marks and slime trails indicate a problem with slugs. Prevent infestation by improving hygiene and by regularly working the soil. In case of an infestation use slug pellets or nematodes to control pest. Handpicking the slug also helps, do this preferably in the evening hours.
- 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.