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Polygonum sachalinense - F.Schmidt.

Common Name Giant Knotweed
Family Polygonaceae
USDA hardiness 4-8
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 Along ravines and by streams in montane areas of Sakhalin Island[58].
Range E. Asia - Japan. Occasionally naturalized in Britain[17].
Edibility Rating    (2 of 5)
Other Uses    (0 of 5)
Weed Potential Yes
Medicinal Rating    (0 of 5)
Care
Fully Hardy Moist Soil Semi-shade Full sun
Polygonum sachalinense Giant Knotweed


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Polygonum sachalinense Giant Knotweed

 

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Summary


Physical Characteristics

 icon of manicon of flower
Polygonum sachalinense is a PERENNIAL growing to 3.6 m (11ft) by 3 m (9ft) at a fast rate.
It is hardy to zone (UK) 5. It is in flower from July to October, and the seeds ripen from August to October. The species is dioecious (individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required). . The plant is not self-fertile.
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 soil.

Synonyms

Reynoutria sachalinensis. (Freidrich.Schmidt.&Petrop.)Nakai.

Habitats

Woodland Garden Dappled Shade; Shady Edge; Ground Cover;

Edible Uses

Edible Parts: Leaves;  Seed;  Stem.
Edible Uses:

Young shoots in spring - raw or cooked[46, 61, 116, 183]. They can be added to salads or cooked as an asparagus substitute[183]. They have an acid flavour and we find that they are more like a rhubarb substitute. Older stems and shoot tips - cooked. The stems are best peeled. Tasting like a mild version of rhubarb, they have a superior quality with a hint of lemon in the flavour[183]. Seed - cooked[105]. The seed can be ground into a powder and used as a thickener and flavouring in soups etc, or as an extender in flour. 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.



None known

Other Uses

Biomass.

A potential source of biomass. Plants are very vigorous and could be grown as a ground cover[208].

Cultivation details

Succeeds in ordinary garden soil in sun or shade[1, 111]. Hardy to about -25°c[187]. An extremely invasive plant, capable of sending up new shoots at a considerable distance from the main clump[1]. Considered a pest in many areas, if grown in the garden it should be planted within a barrier to contain its roots. Plants seem to be immune to the predations of rabbits[233]. Dioecious, male and female plants must be grown if seed is required.

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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 Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

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 nepalenseNepalese smartweed11
Polygonum orientalePrince's Feather, Kiss me over the garden gate22
12

 

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Expert comment

Author

F.Schmidt.

Botanical References

1758200

Links / References

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Subject : Polygonum sachalinense  
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