Polygonum molle
D.Don.
gbif· cc-by-nc
nheather
gbif· cc-by-nc
carl_farmer
gbif· cc-by-nc
carl_farmer
Description
Polygonum molle is a PERENNIAL growing to 2.5 m (8ft 2in) at a fast rate. See above for USDA hardiness. It is hardy to UK zone 7. It is in flower in July, and the seeds ripen from August to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.
Edible Uses
Young shoots - raw or cooked as a vegetable. Pleasantly acid, they are used like rhubarb. Seed - raw or cooked. It is rather small and fiddly to utilize.
Medicinal Uses
Astringent. The whole plant is astringent.
Known Hazards
Although no specific mention has been made for this species, there have been reports that some members of this genus can cause photosensitivity in susceptible people. Many species also contain oxalic acid (the distinctive lemony flavour of sorrel) - whilst not toxic this substance can bind up other minerals making them unavailable to the body and leading to mineral deficiency. Having said that, a number of common foods such as sorrel and rhubarb contain oxalic acid and the leaves of most members of this genus are nutritious and beneficial to eat in moderate quantities. Cooking the leaves will reduce their content of oxalic acid. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition.
Distribution
E. Asia - Himalayas from Uttar Pradesh to S.W. China.
Where It Grows
TEMPERATE ASIA: China (Guangxi Zhuangzu Zizhiqu, Guizhou Sheng, Xizang Zizhiqu, Yunnan Sheng) TROPICAL ASIA: Bhutan, India (Sikkim, Assam, Uttar Pradesh), Sri Lanka, Nepal, Myanmar (north), Thailand (north), Indonesia (Jawa, Sumatera), Malaysia (Malaya)
Cultivation
Succeeds in an ordinary garden soil but prefers a moisture retentive not too fertile soil in sun or part shade. Repays generous treatment. A very fast growing plant. Plants seem to be immune to the predations of rabbits.
Propagation
Seed - sow spring in a cold frame. Germination is usually free and easy. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer if they have reached sufficient size. If not, overwinter them in a cold frame and plant them out the following spring after the last expected frosts. Division in spring or autumn. Very easy, larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.
Other Uses
Soil stabilization. Plants are very fast growing and are used to reclothe and stabilize land slips. They are best spaced about 1.2 metres apart each way.
