Wisteria sinensis, commonly known as the Chinese wisteria, is a species of flowering plant in the pea family, native to China, in the provinces of Guangxi, Guizhou, Hebei, Henan, Hubei, Shaanxi, and Yunnan. Growing 20–30 m (66–98 ft) tall, it is a deciduous vine. It is widely cultivated in temperate regions for its twisting stems and masses of scented flowers in hanging racemes, in spring.
Wisteria sinensis clings to supporting plants or man-made structures by counterclockwise-twining stems. The leaves are shiny, green, pinnately compound, 10–30 cm in length, with 9-13 oblong leaflets that are each 2–6 cm long. The flowers are white, violet, or blue, produced on 15–20 cm racemes before the leaves emerge in spring. The flowers on each raceme open simultaneously before the foliage has expanded, and have a distinctive fragrance similar to that of grapes. Though it has shorter racemes than Wisteria floribunda (Japanese wisteria), it often has a higher quantity of racemes. The fruit is a flattened, brown, velvety, bean-like pod 5–10 cm long with thick disk-like seeds around 1 cm in diameter spaced evenly inside; they mature in summer and crack and twist open to release the seeds; the empty pods often persist until winter. However seed production is often low, and most regenerative growth occurs through layering and suckering.
All parts of the plant contain a glycoside called wisterin which is toxic if ingested and may cause nausea, vomiting, stomach pains, and diarrhea. Wisterias have caused poisoning in children of many countries, producing mild to severe gastroenteritis.
Cultivation and history edit
Wisteria sinensis was unknown in the west before 1816, when several agents of the East India Company working in China sent cuttings back to England. Over the next several decades the plant became, and remains, one of the quintessential ornamental vines in temperate gardens worldwide. A 200-year-old specimen, growing at Griffin's Brewery in Chiswick, London, is often cited as the UK's oldest living wisteria plant.
Wisteria sinensis is most commonly trained along garden walls, along the exterior of buildings, or over a pergola to create avenues of overhanging blossoms during bloom. It may also be trained as a freestanding tree.
Chinese wisteria is more sensitive to cold than American wisteria (Wisteria frutescens) and Japanese wisteria (Wisteria floribunda). Although root hardy to USDA Zone 5 (-20 Fahrenheit), the vine can suffer serious dieback during such cold snaps. Moreover, the frequency of spring frosts in Zones 5 and 6 can kill latent flower buds, so that the plant might only bloom sporadically.
In addition to the white 'Alba', 'Prolific' features the classic purple flowers, but in greater abundance with larger racemes. It also blooms at an earlier age than the traditional cultivar. The variety 'Amethyst' has deeper colored reddish violet flowers that are extremely fragrant. The cultivars 'Prolific', 'Amethyst' and 'Jako' have gained the Royal Horticultural Society's Award of Garden Merit
The Sierra Madre Wistaria (the preferred spelling)
- "Wisteria..." Parks & Gardens UK. 2014-02-08. Retrieved 2017-06-05.
- "Battle to save historic wisteria (From Your Local Guardian)". Yourlocalguardian.co.uk. Retrieved 2015-07-30.
- "The oldest wisteria in England". www.fullers.co.uk. 2015-05-06. Retrieved 2017-06-05.
- "Wisteria sinensis (Sims) DC". Natural Resources Conservation Service, United States Department of Agriculture. Retrieved December 13, 2014.
- Palma, Claudia (March 10, 2016). What to know if you're heading to Sierra Madre's Wistaria Festival. Retrieved August 21, 2016.
- "Wisteria sinensi 'Prolific'". Missouribotanicalgarden.org. Retrieved 2017-11-29.
- Peter., Valder (1995). Wisterias : a comprehensive guide. Portland, Or.: Timber Press. ISBN 0881923184. OCLC 32647814.
- "Wisteria sinensis 'Prolific'". RHS. Retrieved 18 February 2019.
- "Wisteria sinensis 'Amethyst'". RHS. Retrieved 18 February 2019.
- "Wisteria sinensis f. alba 'Jako'". RHS. Retrieved 18 February 2019.
- "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 108. Retrieved 18 February 2019.
- Media related to Wisteria sinensis at Wikimedia Commons