Kerria japonica
| Kerria japonica | |
| Light: |   |
| Moisture: |  |
| Hardiness: | 4 |
| Soil pH: | 5.6-8.4 |
| Height: | 7' |
| Width: | 7' |
| Speed: | Moderate |
| Blooms: | Mid Spring-Late Spring |
| Open Woods Forest | |
| Native to: | |
| Edible Rating: |  |
| Medicinal Rating: |  |
| Tea: | Yes |
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Kerria japonica (common name: bachelor's button)
Propagation: Seed - we have no details on this species but suggest sowing the seed as soon as it is ripe in a cold frame. Sow stored seed as soon as possible in a cold frame, it is likely to require a period of cold stratification. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the cold frame for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts.
Division of suckers, removed with care from established plants during the dormant season[1]. Larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.
Cuttings of young shoots. Young basal shoots in early summer work quite well. Harvest the shoots when they are about 10 - 15cm long with plenty of underground stem. Pot them up into individual pots and keep them in light shade in a cold frame or greenhouse until they are rooting well. Plant them out in the summer.
Layering.
Cultivation: Succeeds in most aspects in any good loamy soil[2]. Succeeds in very poor soils[3]. Grows well in heavy clay soils. Prefers a moist well-drained soil in a sunny position with shade from the midday sun[1].
Hardy to about -20°c[4].
Plants are moderately fast growing[3]. They sucker freely and can be invasive[3].
Some named forms have been developed for their ornamental value[5].
This species is notably resistant to honey fungus[1].
The flowers are said to be usually unisexual but we do not know if the plants are dioecious or monoecious.
Range: E. Asia - China, Japan. A rare garden escape in Britain.
Habitat: By rivers and on rocks in gorges in the mountains[4]. Thickets on mountain slopes at elevations of 200 - 3000 metres[6].
Edibility: Young leaves - cooked[7][8]. The leaves contain a small amount (0.002%) of hydrogen cyanide and are also a rich source of vitamin C (200mg per 100g)[9]. Some caution is advised, see the notes above on toxicity.
Fruit[8]. No more details are given, but this report is somewhat suspect, the plant does not produce a fleshy fruit and the seed case certainly does not look edible[K]. The fruit is a dry, somewhat plump achene about 5mm in diameter[1].
Medicinal: A decoction of the flowering shoots is used in the treatment of coughs and women's complaints[10][9].
Pollinators: Insects
Soil: Can grow in light, medium, and heavy soils.
Drainage: Prefers well drained soil.
Flower Type: Monoecious
Heavy Clay: Grows in heavy-clay soils.
Known Hazards: The leaves contain small quantities of hydrogen cyanide (prussic acid). In small quantities, hydrogen cyanide has been shown to stimulate respiration and improve digestion, it is also claimed to be of benefit in the treatment of cancer. In excess, however
Links
References
- ↑ 1.0 1.1 1.2 1.3 Huxley, Anthony. The New Royal Horticultural Society Dictionary of Gardening. MacMillan Press, 1992.
- ↑ Chittendon, Fred. RHS Dictionary of Plants. Oxford University Press, 1951.
- ↑ 3.0 3.1 3.2 Davis, Brian. Climbers and Wall Shrubs. Viking, 1990.
- ↑ 4.0 4.1 Phillips, Roger and Martyn Rix. Shrubs. Pan Books, 1989.
- ↑ Thomas, Graham. Ornamental Shrubs, Climbers and Bamboos. Murray, 1992.
- ↑ Flora of China. 1994.
- ↑ Tanaka, Tyōzaburō. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing, 1976.
- ↑ 8.0 8.1 Kunkel, Günther. Plants for Human Consumption. Koeltz Scientific Books, 1984.
- ↑ 9.0 9.1 Duke, James and Edward Ayensu. Medicinal Plants of China. Reference Publications, 1985.
- ↑ Stuart, George. Chinese Materia Medica. Taipei Southern Materials Centre.