Apocynum cannabinum L.
Apocynum cannabinum, commonly known as American hemp, is a perennial.
Apocynum cannabinum was described by Carl Linnaeus in 1753. The name is considered as validly published.
The perennials reach heights of 1 to 1,2 metres, the main growing season is in spring and summer. They have a erect habit.
Apocynum cannabinum is deciduous. The dark-green, simple leaves are opposite. They are lanceolate, entire and petiolate. The foliage is porous.
Flowers and Fruits
Apocynum cannabinum produces cymose corymbs of white tubular flowers from June to September.
The perennials produce an abundance of white follicles from summer to autumn.
The plants form tap roots.
Apocynum cannabinum is native to eastern North America.
The perennials prefer a half-shady situation on moist soil. They prefer soil with a pH between 4,5 and 7 and need a soil depth of at least 30 centimetres for good growth. They tolerate temperatures down to -35Â°C (USDA zone 4) and need a frost-free period of at least 14 weeks.
Tolerance of special soil conditions
- none: soil salinity
- medium: anaerobic soil, drought, calcareous soil
The recommended planting distance is 60 to 110 centimetres.
Maintenance and Propagation
The plants usually require only a moderate amount of maintenance.
Propagate by sowing.
Apocynum cannabinum is highly 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.