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Index / Search / Polygonum cuspidatum

§1 Plant

Polygonum cuspidatum Siebold & Zucc.

vernacular Japanese knotweed — species · Polygonaceae

USDA
POCU6
GBIF
8213795 syn.
Rank
species
Japanese knotweed (Polygonum cuspidatum)
Platephotograph · AnRo0002 source · iNaturalist ↗

§2Habit & range

Habit and range

Growth habit
Forb/herb, Subshrub
Duration
Perennial
Group
Dicot
Family
Polygonaceae Juss.
Genus
Polygonum
§2a

Native status, by region

  • AK Alaska Introduced
  • CAN Canada Introduced
  • L48 Lower 48 States Introduced
  • SPM St. Pierre & Miquelon Introduced
§2b

County-level range

· 16 counties across 2 states/territories
Legend Native · 0 Introduced · 16 Both · 0 Hover a county for detail.

§3Cultivation

No cultivation specs.

USDA has not characterised this taxon. Roughly four out of five plants in the database lack the detailed cultivation record present here — typically because they have not been the focus of NRCS Plant Materials work. Range and distribution data are unaffected.

§4Counties, by state

Recorded in 16 counties across 2 states/territories.

Montana view state ↗ 11 I ▾
Rhode Island view state ↗ 5 I ▾

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/POCU6 ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/8213795 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

fetched 2026-05-25T18:27:19Z