Pollinator plant

Japanese Knotweed

Fallopia japonica

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Common names

57 names · 35 languages
EnglishYour language
+4 more namesShow fewer names
Other languages (34)
Dutch
French
Belarusian
  • Рэйнаутрыя японская, ці Грэчка японская[4]
Bulgarian
  • Японска фалопия[4]
Chinese (Simplified)
Chinese (Traditional)
Croatian
  • Japanski dvornik[4]
Czech
  • křídlatka japonská[4]
Danish
  • Japanpileurt[4]
Esperanto
  • Japana falopio[4]
Estonian
  • jaapani kirburohi[4]
  • vooljas kirburohi[4]
  • vooljas konnatatar[4]
+1 more nameShow fewer names
  • vooljas pargitatar[4]
Finnish
  • japanintatar[4]
  • neidontatar[4]
German
  • Japanischer Flügelknöterich[3]
  • Japanischer Staudenknöterich[2][3][4]
  • Japanknöterich[2][4]
+2 more namesShow fewer names
Hungarian
  • japán óriáskeserűfű[4]
  • Ártéri japánkeserűfű[4]
Irish
  • Glúineach bhiorach[4]
Italian
Japanese
  • イタドリ[4]
  • ケイタドリ[4]
  • ベニイタドリ[4]
+1 more nameShow fewer names
  • メイゲツソウ[4]
Korean
Latvian
  • Japānas dižsūrene[4]
Lithuanian
  • Japoninis pelėvirkštis[4]
  • Japoninė reinutrė[4]
Luxembourgish
  • Japanescht Knuetkraut[4]
Norwegian
  • parkslirekne[4]
Polish
  • rdestowiec ostrokończysty[4]
Portuguese
  • Sanguinária-do-japão[2][4]
Romanian
Russian
  • Рейнутрия японская[4]
Slovak
  • pohánkovec japonský[4]
Slovenian
  • Japonski dresnik[4]
Spanish
  • Hierba nudosa japonesa[2][4]
Swedish
  • parkslide[4]
  • rosenslide[4]
  • vanligt parkslide[4]
Turkish
  • Japon poligonumu[4]
Ukrainian
  • Далекосхідна гречка японська[4]
Vietnamese
  • Cốt khí củ[4]
Welsh
  • Canclwm Japan[4]
Sources & name notes (4)

Names recorded in our plant catalogue and botanical sources, grouped by language. Usage can vary by region.

Catalogue language labels are reviewed separately from botanical source records.

Numbered references identify names recorded by an external source. Other names are from our plant catalogue.

[1] Reynoutria japonica — Plant Toolbox common names ↗

NC State Extension Gardener Plant Toolbox; English common names in a United States horticultural reference.

Source records
  • Japanese Knotweed — ul#common_names > li:nth-of-type(5); heading: Common Name(s):; Reynoutria japonica.
  • Asiatic Knotweed — ul#common_names > li:nth-of-type(1); heading: Common Name(s):; Reynoutria japonica.
  • Donkey Rhubarb — ul#common_names > li:nth-of-type(2); heading: Common Name(s):; Reynoutria japonica.
  • Fleeceflower — ul#common_names > li:nth-of-type(3); heading: Common Name(s):; Reynoutria japonica.
  • Japanese Bamboo — ul#common_names > li:nth-of-type(4); heading: Common Name(s):; Reynoutria japonica.
[2] Reynoutria japonica — iNaturalist taxon names ↗

Community-curated iNaturalist taxonomy. This is a common-name attestation, not an independent botanical determination.

Source records
  • Japanese knotweed — results[0].names[6]; taxon id 914922; Reynoutria japonica.
  • Japanischer Staudenknöterich — results[0].names[46]; taxon id 914922; Reynoutria japonica.
  • Japanknöterich — results[0].names[51]; taxon id 914922; Reynoutria japonica.
  • Kamtschatka-Knöterich — results[0].names[49]; taxon id 914922; Reynoutria japonica.
  • Riesenknöterich — results[0].names[42]; taxon id 914922; Reynoutria japonica.
  • Asiatic Knotweed — results[0].names[7]; taxon id 914922; Reynoutria japonica.
  • donkey rhubarb — results[0].names[47]; taxon id 914922; Reynoutria japonica.
  • Itadori knotweed — results[0].names[53]; taxon id 914922; Reynoutria japonica.
  • Japanese fleece flower — results[0].names[13]; taxon id 914922; Reynoutria japonica.
  • Hierba nudosa japonesa — results[0].names[40]; taxon id 914922; Reynoutria japonica.
  • Renouée du Japon — results[0].names[11]; taxon id 914922; Reynoutria japonica.
  • poligono giapponese — results[0].names[45]; taxon id 914922; Reynoutria japonica.
  • Compacte Duizendknoop — results[0].names[25]; taxon id 914922; Reynoutria japonica.
  • Japanse duizendknoop — results[0].names[9]; taxon id 914922; Reynoutria japonica.
  • Sanguinária-do-japão — results[0].names[5]; taxon id 914922; Reynoutria japonica.
[3] Catalogue of Life 2026-08-20 — Reynoutria japonica ↗

Common names from World Plants, version 26.05, reproduced in Catalogue of Life 2026-08-20. License: CC BY.

Source records
  • Japanese Knotweed (EN) — VernacularName.tsv, line 150184; taxon 793ZB.
  • Japanischer Staudenknöterich (DE) — VernacularName.tsv, line 150186; taxon 793ZB.
  • Japanischer Flügelknöterich — VernacularName.tsv, line 150185; taxon 793ZB.
[4] Reynoutria japonica — iNaturalist taxon names ↗

Community-curated iNaturalist taxonomy; common-name attestation, not an independent botanical determination.

Source records
  • Japanese knotweed — results[24].names[6]; taxon id 914922; Reynoutria japonica.
  • Japanischer Staudenknöterich — results[24].names[46]; taxon id 914922; Reynoutria japonica.
  • Japanknöterich — results[24].names[51]; taxon id 914922; Reynoutria japonica.
  • Kamtschatka-Knöterich — results[24].names[49]; taxon id 914922; Reynoutria japonica.
  • Riesenknöterich — results[24].names[42]; taxon id 914922; Reynoutria japonica.
  • Asiatic Knotweed — results[24].names[7]; taxon id 914922; Reynoutria japonica.
  • donkey rhubarb — results[24].names[47]; taxon id 914922; Reynoutria japonica.
  • Itadori knotweed — results[24].names[53]; taxon id 914922; Reynoutria japonica.
  • Japanese fleece flower — results[24].names[13]; taxon id 914922; Reynoutria japonica.
  • Hierba nudosa japonesa — results[24].names[40]; taxon id 914922; Reynoutria japonica.
  • Renouée du Japon — results[24].names[11]; taxon id 914922; Reynoutria japonica.
  • poligono giapponese — results[24].names[45]; taxon id 914922; Reynoutria japonica.
  • Compacte Duizendknoop — results[24].names[25]; taxon id 914922; Reynoutria japonica.
  • Japanse duizendknoop — results[24].names[9]; taxon id 914922; Reynoutria japonica.
  • Sanguinária-do-japão — results[24].names[5]; taxon id 914922; Reynoutria japonica.
  • rdestowiec ostrokończysty — results[24].names[1]; taxon id 914922; Reynoutria japonica.
  • 虎杖 — results[24].names[2]; taxon id 914922; Reynoutria japonica.
  • parkslirekne — results[24].names[4]; taxon id 914922; Reynoutria japonica.
  • イタドリ — results[24].names[8]; taxon id 914922; Reynoutria japonica.
  • japanintatar — results[24].names[10]; taxon id 914922; Reynoutria japonica.
  • křídlatka japonská — results[24].names[12]; taxon id 914922; Reynoutria japonica.
  • Ártéri japánkeserűfű — results[24].names[14]; taxon id 914922; Reynoutria japonica.
  • Japonski dresnik — results[24].names[15]; taxon id 914922; Reynoutria japonica.
  • Cốt khí củ — results[24].names[16]; taxon id 914922; Reynoutria japonica.
  • Glúineach bhiorach — results[24].names[17]; taxon id 914922; Reynoutria japonica.
  • Canclwm Japan — results[24].names[18]; taxon id 914922; Reynoutria japonica.
  • Japana falopio — results[24].names[19]; taxon id 914922; Reynoutria japonica.
  • Японска фалопия — results[24].names[20]; taxon id 914922; Reynoutria japonica.
  • Рейнутрия японская — results[24].names[21]; taxon id 914922; Reynoutria japonica.
  • Japanpileurt — results[24].names[22]; taxon id 914922; Reynoutria japonica.
  • parkslide — results[24].names[23]; taxon id 914922; Reynoutria japonica.
  • メイゲツソウ — results[24].names[24]; taxon id 914922; Reynoutria japonica.
  • neidontatar — results[24].names[26]; taxon id 914922; Reynoutria japonica.
  • Japoninė reinutrė — results[24].names[27]; taxon id 914922; Reynoutria japonica.
  • Japoninis pelėvirkštis — results[24].names[28]; taxon id 914922; Reynoutria japonica.
  • Japanski dvornik — results[24].names[29]; taxon id 914922; Reynoutria japonica.
  • ケイタドリ — results[24].names[30]; taxon id 914922; Reynoutria japonica.
  • vooljas pargitatar — results[24].names[31]; taxon id 914922; Reynoutria japonica.
  • vooljas konnatatar — results[24].names[32]; taxon id 914922; Reynoutria japonica.
  • vooljas kirburohi — results[24].names[33]; taxon id 914922; Reynoutria japonica.
  • jaapani kirburohi — results[24].names[34]; taxon id 914922; Reynoutria japonica.
  • pohánkovec japonský — results[24].names[35]; taxon id 914922; Reynoutria japonica.
  • 호장근 — results[24].names[36]; taxon id 914922; Reynoutria japonica.
  • Japanescht Knuetkraut — results[24].names[37]; taxon id 914922; Reynoutria japonica.
  • Japon poligonumu — results[24].names[38]; taxon id 914922; Reynoutria japonica.
  • rosenslide — results[24].names[39]; taxon id 914922; Reynoutria japonica.
  • vanligt parkslide — results[24].names[41]; taxon id 914922; Reynoutria japonica.
  • Iulișcă — results[24].names[43]; taxon id 914922; Reynoutria japonica.
  • ベニイタドリ — results[24].names[44]; taxon id 914922; Reynoutria japonica.
  • Рэйнаутрыя японская, ці Грэчка японская — results[24].names[48]; taxon id 914922; Reynoutria japonica.
  • 虎杖 — results[24].names[50]; taxon id 914922; Reynoutria japonica.
  • Japānas dižsūrene — results[24].names[52]; taxon id 914922; Reynoutria japonica.
  • japán óriáskeserűfű — results[24].names[54]; taxon id 914922; Reynoutria japonica.
  • Далекосхідна гречка японська — results[24].names[55]; taxon id 914922; Reynoutria japonica.
Plant references

Source-backed information

Published observations for this plant. Each reference supports the information beside it.

Taxonomy
Catalogue of Life treats Fallopia japonica as a synonym of Reynoutria japonica.

Taxonomic treatment in the August 2026 release; the catalogue record name is preserved.

Sources [1] [2]
Botanical family
Polygonaceae

Family in the cited taxonomic treatment.

Sources [2]
Mature height
3.05–3.96 m

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life. Converted from the source range in feet and inches; mature size varies with growing conditions.

Sources [3]
Mature spread
0.91–6.1 m

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life. Converted from the source range in feet and inches; mature size varies with growing conditions.

Sources [3]
Plant habit
Arching

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life.

Sources [3]
Life cycle
Perennial

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life.

Sources [3]
Growth rate
Rapid

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life.

Sources [3]
Light
Full sun (6 or more hours of direct sunlight a day)

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life.

Sources [3]
Moisture and drainage
Moist; Occasionally Wet

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life.

Sources [3]
Flowering season
Autumn; Summer

NC State Extension profile, published as Reynoutria japonica; accepted-name linkage follows Catalogue of Life. Seasons reflect the source region and do not verify the catalogue’s exact flowering months.

Sources [3]
Native range
Russian Far East to China and Temp. E. Asia.

Explicit native locality records in Kew WCVP v16; introduced and doubtful distributions excluded. Continent conversion follows the documented geographic mapping.

Sources [4]
Catalogue ratings

Who this plant supports

Honey bees

Medium suitability
Nectar value Medium
Pollen value Medium
Plant profile

About this plant

Japanese Knotweed (Fallopia japonica) is a herbaceous plant. It flowers from August to September.

Sources and references

References for the information marked with source numbers on this page.

Sources checked
  1. Catalogue of Life Fallopia japonica — Catalogue of Life COL26.8

    COL26.8 (2026-08-20). Contributing checklist: Synonymic Checklists of the Vascular Plants of the World. This is taxonomic evidence, not an independent ecological study.

    Supports: Taxonomy
    Relevant sections
    • Taxonomy: NameUsage.tsv line 238335; ID 3DTRD; rank species; status synonym

    Source checked on .

    Source data licence: CC BY 4.0.

  2. Catalogue of Life Reynoutria japonica — Catalogue of Life COL26.8

    COL26.8 (2026-08-20). Contributing checklist: Synonymic Checklists of the Vascular Plants of the World. This is taxonomic evidence, not an independent ecological study.

    Supports: TaxonomyBotanical family
    Relevant sections
    • Taxonomy: NameUsage.tsv line 2649306; ID 793ZB; rank species; status accepted
    • Botanical family: NameUsage.tsv line 2649306; ID 793ZB; rank species; status accepted

    Source checked on .

    Source data licence: CC BY 4.0.

  3. NC State Extension Reynoutria japonica — Plant Toolbox

    NC State Extension Gardener Plant Toolbox. Growing conditions and seasons reflect its United States horticultural context.

    Supports: Mature heightMature spreadPlant habitLife cycleGrowth rateLightMoisture and drainageFlowering season
    Relevant sections
    • Mature height: Dimensions / Height
    • Mature spread: Dimensions / Width
    • Plant habit: Habit/Form
    • Life cycle: Life Cycle
    • Growth rate: Growth Rate
    • Light: Light
    • Moisture and drainage: Soil Drainage
    • Flowering season: Flower Bloom Time

    Source checked on .

  4. Royal Botanic Gardens, Kew Reynoutria japonica — Kew WCVP native distribution

    Native distribution and taxonomic treatment from the official WCVP v16 export (4 June 2026). The link opens the corresponding POWO taxon. Source rows are retained in the native-range audit archive.

    Supports: Native range
    Relevant sections
    • Native range: WCVP v16; wcvp_names.csv lines 158617, 158622; wcvp_distribution.csv native locality lines 873522, 873523, 873524, 873525, 873526, 873529, 873530, 873531, 873532, 873533, 873534, 873535, 873536, 873537

    Source checked on .

    Source data licence: CC BY 3.0.