Menu list goes here

Herbal Database Search Results

Back to: Pathways Main Search Page For Metaphysical uses visit The Witchs Haven

Polygonum polystachyum

Common name:	Himalayan Knotweed	Family:	Polygonaceae
Author:	Wall.	Botanical references:	51, 200, 266
Synonyms:	Persicaria wallichii, Persicaria polystachya ((Wall.)Gross.)
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].
Range:	E. Asia - Himalayas. Occasionally naturalized in Britain, it is common in S.W. England[17].
Habitat:	Forests, shrubberies and open slopes, often gregarious, 2000 - 4000 metres from Afghanistan to S.W. China[51].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Aconogonon polystachyum[H] Aconogonum polystachyum[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	Afgaanse Duizendknoop [D], Cultivated Knotweed [P], Garden Knotweed [B],
Epithets:	From a Dictionary of Botanical Epithets
	polystachyum = many spikes
Systematics:	From a USDA Plants Database
	Order: Polygonales. Buckwheat family
Noxious, Invasive and Injurious Weeds	From USDA PLANTS database, Weeds Australia , DEFRA Injurious Weeds
	Listed as noxious/invasive for: California, Oregon.

Physical Characteristics

Perennial growing to 1.8m by 1.5m at a fast rate. It is hardy to zone 6. It is in flower from July to September, and the seeds ripen from September to October. The flowers are hermaphrodite (have both male and female organs). We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats and Possible Locations

Woodland, Dappled Shade, Shady Edge, Ground Cover.

Edible Uses

Leaves Seed Stem.

Leaves - cooked[51].
Seed - raw or cooked. It is rather small and fiddly to utilize.

Medicinal Uses

Disclaimer

None known

Other Uses

Ground cover.

Plants are very vigorous and can be grown for ground cover, succeeding even on the verges of streams[208]. They are best spaced about 1.2 metres apart each way[208].

Cultivation details

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].
A vigorously spreading plant, it is only really suitable for large areas of ground[233].
Plants are easily mistaken for P. campanulatum[51].
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.
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.

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[H] Details of Scandanavian and European Common names in Henriette's names database
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[C] Taxon data. from the CalFlora database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Aconogonon polystachyum (a possible synonym).

[H] Details of Scandanavian and European Common names in Henriette's names database

References for the family Polygonaceae.

[CHINA] Draft Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[17] Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962
A very comprehensive flora, the standard reference book but it has no pictures.

[51] Polunin. O. and Stainton. A. Flowers of the Himalayas. Oxford Universtiy Press 1984
A very readable and good pocket guide (if you have a very large pocket!) to many of the wild plants in the Himalayas. Gives many examples of plant uses.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[208] Thomas. G. S. Plants for Ground Cover J. M. Dent & Sons 1990 ISBN 0-460-12609-1
An excellent detailled book on the subject, very comprehensive.

[233] Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. 1990 ISBN 0 460 86048 8
A concise guide to a wide range of perennials. Lots of cultivation guides, very little on plant uses.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

[266] Flora of China 1994
On-line version of the Flora - an excellent resource giving basic info on habitat and some uses.

Readers Comments

Main Search Page Help Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
Website: www.pfaf.org Phone: 0845 458 4719/_44(0) 1208 872963

This page (UK) http://www.comp.leeds.ac.uk/cgi-bin/pfaf/arr_html?Polygonum+polystachyum
This page (US) http://www.ibiblio.org/pfaf/cgi-bin/arr_html?Polygonum+polystachyum

This work is licensed under a Creative Commons License.
(You can copy, distribute, display this works but: Attribution is required, its for Non-Commercial purposes, and it's Share Alike (GNUish/copyleft) i.e. has an identical license.)
We also ask that you let us know (michael@thewitchshaven.com) if you link to, redistribute, make a derived work or do anything groovy with this information.

Pathways Home :: View Cart :: Shipping & Returns :: Contact Us :: Privacy Policy :: Philosophy :: The Witchs Haven

We make no claims of magical effects or supernatural powers for any item in this catalog. In spite of legendary attributes or occult and craft tradition, such items are offered as curios only and beliefs concerning their magical effectiveness are related only for historical interest.