This is an archived copy of this article, recovered after a server failure in January 2022.

Some links may be broken, and editing is disabled. We are working to bring back full functionality.

Polygonum polystachyum
  • Himalayan Knotweed

a perennial member of the Polygonum genus in the family Polygonaceae.

Niche
  • Soil surface
    Soil surface
    There are no details available for this niche.
Functions
  • Ground cover
    Ground cover
    There are no details available for this function.
Light
  • Full sun
    Full sun
    The amount of sun exposure that a plant prefers in ideal conditions.
    Key
  • light shade
    Light shade
    The amount of shade a plant will tolerate without adverse health affects.
    Key
Water
  • Water Requirementsmoderate
    Moderate
    The amount of water a plant needs for healthy growth, relative to other plants.
    Key
Soil
  • acid,neutral,alkaline
    Unknown
    The PH range (acidity or alkilinity) of the growth medium ideal for healthy nutrient absorbtion.
    Key
  • Sandy to Clay
    The soil texture this plant prefers for optimal growth.
    Key
Cold & Heat
  • 6
    Zone 6
    The USDA Hardiness scale assigns plants a number from 1 to 12 representing the minimum temperature a plant can survive.
    Key
    0< -53.9ºC< -65ºF
    1-51.1ºC-60ºF
    2-45.6ºC-50F
    3-40ºC-40ºF
    4-34.4ºC-30ºF
    5-28.9ºC-20ºF
    6-23.3ºC-10ºF
    7-17.8ºC0ºF
    8-12.2C10ºF
    9-6.7ºC20ºF
    10-1.1ºC30ºF
    114.4ºC40ºF
    12> 10ºC> 5ºF
  • ?
    Unknown
    The AHS Heat scale assigns plants a number from 1 to 12 representing the number of days per year a plant requires a temperature exceeding 30ºC (86ºF).
    Key
    11
    21 - 7
    38 - 14
    415 - 30
    531 - 45
    646 - 60
    761 - 90
    891 - 120
    9121 - 150
    10151 - 180
    11181 - 210
    12181 - 210
Polygonum polystachyum has 0 edible uses listed

Uses

Toxic parts

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[1].

Edible uses

Notes

Leaves - cooked[2]. Seed - raw or cooked. It is rather small and fiddly to utilize.

Leaves

Unknown use

Seed

Unknown use

Stem

Unknown use

Material uses

Plants are very vigorous and can be grown for ground cover, succeeding even on the verges of streams[3]. They are best spaced about 1.2 metres apart each way[3].
There are no material uses listed for Polygonum polystachyum.

Medicinal uses(Warning!)

There are no medicinal uses listed for Polygonum polystachyum.

Ecology

Ecosystem niche/layer

Soil surface

Ecological Functions

Ground cover

Forage

Nothing listed.

Shelter

Nothing listed.

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.

Practical Plants is currently lacking information on propagation instructions of Polygonum polystachyum. Help us fill in the blanks! Edit this page to add your knowledge.



Cultivation

Succeeds in an ordinary garden soil[4] but prefers a moisture retentive not too fertile soil in sun or part shade[5]. Repays generous treatment[4].

A vigorously spreading plant, it is only really suitable for large areas of ground[6]. Plants are easily mistaken for P. campanulatum[2].

Plants seem to be immune to the predations of rabbits[6].

Crops

Problems, pests & diseases

Associations & Interactions

There are no interactions listed for Polygonum polystachyum. Do you know of an interaction that should be listed here? edit this page to add it.

Polycultures & Guilds

There are no polycultures listed which include Polygonum polystachyum.

Descendants

Cultivars

Varieties

None listed.

Subspecies

None listed.

Full Data

This table shows all the data stored for this plant.

Taxonomy
Binomial name
Polygonum polystachyum
Genus
Polygonum
Family
Polygonaceae
Imported References
Edible uses
[2]
Medicinal uses
Material uses & Functions
[3]
Botanic
[2][5][7]
Propagation
Cultivation
Environment
Cultivation
Uses
Edible uses
None listed.
Material uses
None listed.
Medicinal uses
None listed.
Functions & Nature
Functions
Ground cover
Provides forage for
Provides shelter for
Environment
Hardiness Zone
6
Heat Zone
?
Water
moderate
Sun
full sun
Shade
light shade
Soil PH
acid, neutral, alkaline
Soil Texture
sandy, loamy, clay
Soil Water Retention
Environmental Tolerances
    Ecosystems
    Native Climate Zones
    None listed.
    Adapted Climate Zones
    None listed.
    Native Geographical Range
    None listed.
    Native Environment
    None listed.
    Ecosystem Niche
    Soil surface
    Root Zone Tendancy
    None listed.
    Life
    Deciduous or Evergreen
    ?
    Herbaceous or Woody
    ?
    Life Cycle
    perennial
    Growth Rate
    vigorous
    Mature Size
    1.8 x 1.5 meters
    Fertility
    ?
    Pollinators
    ?
    Flower Colour
    ?
    Flower Type
    hermaphrodite











    References

    1. ? Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. ISBN 0-7513-020-31 (1995-00-00)
    2. ? 2.02.12.22.3 Polunin. O. and Stainton. A. Flowers of the Himalayas. Oxford Universtiy Press (1984-00-00)
    3. ? 3.03.13.2 Thomas. G. S. Plants for Ground Cover J. M. Dent & Sons ISBN 0-460-12609-1 (1990-00-00)
    4. ? 4.04.1 F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press (1951-00-00)
    5. ? 5.05.1 Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press ISBN 0-333-47494-5 (1992-00-00)
    6. ? 6.06.1 Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. ISBN 0 460 86048 8 (1990-00-00)
    7. ? [Flora of China] (1994-00-00)

    Cite error: <ref> tag with name "PFAFimport-17" defined in <references> is not used in prior text.


    Retrieved from "https://practicalplants.org/w/index.php?title=Polygonum_polystachyum&oldid=79599"
    Facts about "Polygonum polystachyum"RDF feed
    Article is incompleteYes +
    Article requires citationsNo +
    Article requires cleanupYes +
    Belongs to familyPolygonaceae +
    Belongs to genusPolygonum +
    Functions asGround cover +
    Has binomial namePolygonum polystachyum +
    Has common nameHimalayan Knotweed +
    Has drought toleranceIntolerant +
    Has edible partLeaves +, Seed + and Stem +
    Has edible useUnknown use +
    Has flowers of typeHermaphrodite +
    Has growth rateVigorous +
    Has hardiness zone6 +
    Has lifecycle typePerennial +
    Has mature height1.8 +
    Has mature width1.5 +
    Has search namepolygonum polystachyum + and himalayan knotweed +
    Has shade toleranceLight shade +
    Has soil ph preferenceAcid +, Neutral + and Alkaline +
    Has soil texture preferenceSandy +, Loamy + and Clay +
    Has sun preferenceFull sun +
    Has taxonomic rankSpecies +
    Has taxonomy namePolygonum polystachyum +
    Has water requirementsmoderate +
    Inhabits ecosystem nicheSoil surface +
    Is taxonomy typeSpecies +
    PFAF cultivation notes migratedNo +
    PFAF edible use notes migratedNo +
    PFAF material use notes migratedNo +
    PFAF medicinal use notes migratedYes +
    PFAF propagation notes migratedNo +
    PFAF toxicity notes migratedNo +
    Tolerates nutritionally poor soilNo +
    Uses mature size measurement unitMeters +
    Has subobjectThis property is a special property in this wiki.Polygonum polystachyum +, Polygonum polystachyum + and Polygonum polystachyum +