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Polygonum nepalense - Meissn.
                 
Common Name Nepalese smartweed
Family Polygonaceae
USDA hardiness Coming soon
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[238].
Habitats Usually common in damp shaded situations, 1700 - 2000 metres in Srinagar. Damp woods in mountains all over Japan[58]. Exposed rocky slopes, 1200 - 4000 metres in Nepal[272].
Range E. Asia - China, Japan, Korea, Himalayas.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Care
Moist Soil Wet Soil Semi-shade Full sun

Summary

Polygonum nepalense Nepalese smartweed


Polygonum nepalense Nepalese smartweed
   
Physical Characteristics
 icon of manicon of flower
Polygonum nepalense is a ANNUAL growing to 0.3 m (1ft). It is in flower from Jun to September, and the seeds ripen from Jul to October. The flowers are hermaphrodite (have both male and female organs)Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist or wet soil.

Synonyms
Persicaria nepalense. (Meissn.)Miyabe.

Habitats
Woodland Garden Dappled Shade; Shady Edge; Bog Garden;
Edible Uses
Edible Parts: Leaves;  Seed.
Edible Uses:

Tender young leaves and shots - raw or cooked as a vegetable[177, 272]. Seed - raw or cooked. It is rather small and fiddly to utilize.
Medicinal Uses


Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Febrifuge;  Poultice.

A juice of the root is used in the treatment of fevers[272]. A paste of the root is used as a poultice on fresh wounds[272].
Other Uses
Soap.

The squeezed plant is used for washing clothes[272].
Cultivation details
We have very little information on this species and do not know if it is hardy in Britain, though it should succeed as a spring-sown annual in this country. The following notes are based on the general needs of the genus. Succeeds in an ordinary garden soil[1] but prefers a moisture retentive not too fertile soil in sun or part shade[200]. Repays generous treatment[1]. Plants seem to be immune to the predations of rabbits[233].
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.

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Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Polygonum alaskanumAlaska Wild Rhubarb21
Polygonum alpinumAlpine Knotweed, Alaska wild rhubarb21
Polygonum amphibiumWillow Grass, Water knotweed, Longroot smartweed, Water smartweed12
Polygonum arenastrumSmall-Leaved Knotweed, Oval-leaf knotweed23
Polygonum aviculareKnotweed, Prostrate knotweed23
Polygonum barbatumJoint Weed11
Polygonum bistortaBistort, Meadow bistort, Snakeweed33
Polygonum bistortoidesAmerican Bistort31
Polygonum bungeanumBunge's smartweed10
Polygonum coccineumWater Smartweed10
Polygonum conspicuum 10
Polygonum convolvulusBlack Bindweed10
Polygonum divaricatum 10
Polygonum douglasiiKnotweed, Douglas' knotweed, Austin knotweed, Engelmann's knotweed, Johnston's knotweed, Large kno20
Polygonum dumetorumClimbing false buckwheat11
Polygonum equisetiforme 10
Polygonum fugax 30
Polygonum hydropiperSmartweed, Marshpepper knotweed22
Polygonum japonicumJapanese Knotweed, Mexican Bamboo, Japanese Knotweed33
Polygonum lapathifoliumCurlytop Knotweed11
Polygonum limosum 10
Polygonum longisetumOriental lady's thumb10
Polygonum maackianum 10
Polygonum manshurienseAsian Bistort01
Polygonum microcephalum 10
Polygonum minusPygmy smartweed10
Polygonum molle 21
Polygonum multiflorumHe Shou Wu, Tuber fleeceflower23
Polygonum orientalePrince's Feather, Kiss me over the garden gate22
12
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Expert comment
 
Author
Meissn.
Botanical References
58266272
Links / References
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Subject : Polygonum nepalense  

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