Asclepias tuberosa L.
Asclepias tuberosa is a perennial.
Asclepias tuberosa was described by Carl Linnaeus in 1753. The name is considered as validly published.
The perennials reach heights of 90 to 100 centimetres, the main growing season is in spring and summer. They have a erect habit and are comparatively slow-growing.
Asclepias tuberosa is deciduous. The mid-green to light-green, simple leaves are whorled. They are lanceolate, entire and petiolate. The foliage is porous.
Flowers and Fruits
From June to August Asclepias tuberosa produces showy umbels of semi-double, orange five-stellate flowers.
The perennials produce ornamental brown follicles from summer to autumn.
Asclepias tuberosa is native to the Northeast of the US, the central Northeast of the US, the northern Prairie States of the US, the Southwest of the US, the Rocky Mountains, the southern Prairie States of the US, the Southeast of the US and Florida.
The perennials prefer a sunny situation on moist soil. The substrate should be sandy-loamy or gritty-loamy and comparatively poor with a pH between 4,8 and 6,8. The plants need a soil depth of at least 41 centimetres for good growth. They tolerate temperatures down to -35Â°C (USDA zone 4) and need a frost-free period of at least 19 weeks.
Classification after Prof. Dr. Sieber
- flower beds (rich soil)
Tolerance of special soil conditions
- none: soil salinity, anaerobic soil
- medium: calcareous soil
- high: drought
The recommended planting distance is 50 centimetres, the perennials are best planted in groups of 3 to 5. Suited as cut flowers and as bee pasture.
Maintenance and Propagation
- Winter protection is absolutely necessary.
- Winter protection from late frost.
- Pruning is not tolerated.
Propagate by sowing or by division.
Asclepias tuberosa is toxic.
Please read the health issues note!
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.