Arisaema thunbergii
Taxonomy and growth
Uses
Toxicity
Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.
The plant contains calcium oxylate crystals. These cause an extremely unpleasant sensation similar to needles being stuck into the mouth and tongue if they are eaten but they are easily neutralized by thoroughly drying or cooking the plant or by steeping it in water.
Medicinal uses
Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.
Alterative, anaesthetic, deobstruent, discutient, diuretic, expectorant, vulnerary[3]. The root is used[5].
- Product or use
- Alterative
- Product or use
- Anaesthetic
- Product or use
- Deobstruent
- Product or use
- Diuretic
- Product or use
- Expectorant
- Product or use
- Vulnerary
Environment
- Range
- E. Asia - Japan.
- Habitat
- Not known
- Light
- full sun
- Shade tolerance
- permanent shade
- Water
- moderate
- Soil textures
- sandy, loamy
- Soil pH
- acid, neutral, alkaline
- Drainage
- well drained
- Tolerates Nutritionally Poor Soil
- No
- Drought
- intolerant
Propagation
Seed - best sown as soon as it is ripe in a shady position in a cold frame[2]. Stored seed remains viable for at least a year and can be sown in spring in the greenhouse but it will probably require a period of cold stratification. Germination usually takes place in 1 - 6 months at 15°c[2]. When large enough to handle, prick the seedlings out into individual pots and grow them on in light shade in the greenhouse for at least a coupe of years until the corms are more than 20mm in diameter. Plant out into their permanent positions whilst they are dormant. Division of tubers when the plant dies down in late summer.
Cultivation
Prefers a cool peaty soil in the bog garden, woodland garden or a sheltered border in semi-shade[2][4]. Prefers a loamy or peaty soil and will tolerate a sunny position if the soil is moist but not water-logged and the position is not too hot or exposed[1][4]. Only plant out full sized tubers and mulch them with organic matter in the winter[4]. Plants need protection from slugs[4]. Most species in this genus are dioecious, but they are sometimes monoecious and can also change sex from year to year.
References
F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00
Rice. G. (Editor) Growing from Seed. Volume 2. Thompson and Morgan. 1988-00-00
Stuart. Rev. G. A. Chinese Materia Medica. Taipei. Southern Materials Centre
Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5
Duke. J. A. and Ayensu. E. S. Medicinal Plants of China Reference Publications, Inc. 1985-00-00 ISBN 0-917256-20-4