Index / Search / Polygonum cuspidatum
§1 Plant
Polygonum cuspidatum Siebold & Zucc.
vernacular Japanese knotweed — species · Polygonaceae
§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
· 506 counties across 36 states/territories§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 506 counties across 36 states/territories.
Alaska view state ↗ 3 I ▾
Arkansas view state ↗ 2 I ▾
California view state ↗ 14 I ▾
Colorado view state ↗ 1 I ▾
District of Columbia view state ↗ 1 I ▾
Georgia view state ↗ 3 I ▾
Idaho view state ↗ 19 I ▾
Illinois view state ↗ 33 I ▾
- Adams 17001
- Brown 17009
- Champaign 17019
- Christian 17021
- Coles 17029
- Cook 17031
- Crawford 17033
- DuPage 17043
- Ford 17053
- Jackson 17077
- Kane 17089
- Kankakee 17091
- Kendall 17093
- Knox 17095
- Lake 17097
- Lee 17103
- Livingston 17105
- Logan 17107
- Macon 17115
- Madison 17119
- Mason 17125
- McHenry 17111
- Morgan 17137
- Peoria 17143
- Sangamon 17167
- Schuyler 17169
- St. Clair 17163
- Vermilion 17183
- Wabash 17185
- Warren 17187
- Wayne 17191
- Will 17197
- Winnebago 17201
Indiana view state ↗ 10 I ▾
Iowa view state ↗ 1 I ▾
Kansas view state ↗ 4 I ▾
Kentucky view state ↗ 30 I ▾
- Barren 21009
- Bath 21011
- Bell 21013
- Boone 21015
- Bracken 21023
- Caldwell 21033
- Calloway 21035
- Campbell 21037
- Estill 21065
- Fayette 21067
- Floyd 21071
- Franklin 21073
- Garrard 21079
- Greenup 21089
- Hardin 21093
- Harrison 21097
- Jefferson 21111
- Knox 21121
- Laurel 21125
- Leslie 21131
- Lewis 21135
- Lincoln 21137
- McCracken 21145
- Montgomery 21173
- Perry 21193
- Pike 21195
- Rockcastle 21203
- Rowan 21205
- Whitley 21235
- Wolfe 21237
Louisiana view state ↗ 3 I ▾
Maine view state ↗ 11 I ▾
Massachusetts view state ↗ 14 I ▾
Michigan view state ↗ 19 I ▾
Minnesota view state ↗ 6 I ▾
Mississippi view state ↗ 1 I ▾
Missouri view state ↗ 11 I ▾
Montana view state ↗ 11 I ▾
New Hampshire view state ↗ 8 I ▾
New Jersey view state ↗ 17 I ▾
New York view state ↗ 34 I ▾
- Albany 36001
- Bronx 36005
- Broome 36007
- Cattaraugus 36009
- Cayuga 36011
- Chautauqua 36013
- Chemung 36015
- Delaware 36025
- Dutchess 36027
- Erie 36029
- Greene 36039
- Kings 36047
- Monroe 36055
- Nassau 36059
- New York 36061
- Niagara 36063
- Oneida 36065
- Onondaga 36067
- Orange 36071
- Putnam 36079
- Queens 36081
- Rensselaer 36083
- Richmond 36085
- Rockland 36087
- Schenectady 36093
- Seneca 36099
- Steuben 36101
- Suffolk 36103
- Tioga 36107
- Ulster 36111
- Warren 36113
- Washington 36115
- Wayne 36117
- Westchester 36119
North Carolina view state ↗ 11 I ▾
Ohio view state ↗ 35 I ▾
- Ashland 39005
- Ashtabula 39007
- Athens 39009
- Belmont 39013
- Columbiana 39029
- Coshocton 39031
- Cuyahoga 39035
- Fairfield 39045
- Gallia 39053
- Geauga 39055
- Greene 39057
- Hancock 39063
- Highland 39071
- Holmes 39075
- Jackson 39079
- Jefferson 39081
- Knox 39083
- Lake 39085
- Lawrence 39087
- Lorain 39093
- Mahoning 39099
- Medina 39103
- Montgomery 39113
- Perry 39127
- Portage 39133
- Preble 39135
- Ross 39141
- Scioto 39145
- Stark 39151
- Summit 39153
- Tuscarawas 39157
- Vinton 39163
- Washington 39167
- Wayne 39169
- Wood 39173
Oregon view state ↗ 13 I ▾
Pennsylvania view state ↗ 43 I ▾
- Allegheny 42003
- Armstrong 42005
- Beaver 42007
- Bedford 42009
- Berks 42011
- Blair 42013
- Bradford 42015
- Bucks 42017
- Butler 42019
- Cambria 42021
- Cameron 42023
- Carbon 42025
- Centre 42027
- Chester 42029
- Clarion 42031
- Clearfield 42033
- Clinton 42035
- Crawford 42039
- Cumberland 42041
- Dauphin 42043
- Delaware 42045
- Erie 42049
- Jefferson 42065
- Lackawanna 42069
- Lancaster 42071
- Lehigh 42077
- Luzerne 42079
- McKean 42083
- Mercer 42085
- Mifflin 42087
- Monroe 42089
- Montgomery 42091
- Northampton 42095
- Philadelphia 42101
- Schuylkill 42107
- Somerset 42111
- Tioga 42117
- Venango 42121
- Warren 42123
- Washington 42125
- Wayne 42127
- Westmoreland 42129
- York 42133
Rhode Island view state ↗ 5 I ▾
South Carolina view state ↗ 2 I ▾
Tennessee view state ↗ 16 I ▾
Vermont view state ↗ 7 I ▾
Virginia view state ↗ 40 I ▾
- Accomack 51001
- Albemarle 51003
- Alleghany 51005
- Amelia 51007
- Amherst 51009
- Arlington 51013
- Augusta 51015
- Buchanan 51027
- Campbell 51031
- Caroline 51033
- Charles City 51036
- Chesapeake (city) 51550
- Dickenson 51051
- Fairfax 51059
- Fauquier 51061
- Hampton (city) 51650
- Henrico 51087
- Isle of Wight 51093
- King and Queen 51097
- King George 51099
- Loudoun 51107
- Louisa 51109
- Middlesex 51119
- Newport News (city) 51700
- Northumberland 51133
- Page 51139
- Pittsylvania 51143
- Prince William 51153
- Pulaski 51155
- Rappahannock 51157
- Richmond 51159
- Russell 51167
- Southampton 51175
- Spotsylvania 51177
- Stafford 51179
- Suffolk (city) 51800
- Sussex 51183
- Washington 51191
- Wise 51195
- York 51199
Washington view state ↗ 30 I ▾
- Asotin 53003
- Benton 53005
- Chelan 53007
- Clallam 53009
- Clark 53011
- Columbia 53013
- Cowlitz 53015
- Garfield 53023
- Grant 53025
- Grays Harbor 53027
- Jefferson 53031
- King 53033
- Kitsap 53035
- Kittitas 53037
- Klickitat 53039
- Lewis 53041
- Okanogan 53047
- Pacific 53049
- Pend Oreille 53051
- Pierce 53053
- San Juan 53055
- Skagit 53057
- Skamania 53059
- Snohomish 53061
- Stevens 53065
- Thurston 53067
- Wahkiakum 53069
- Walla Walla 53071
- Whatcom 53073
- Yakima 53077
West Virginia view state ↗ 22 I ▾
Wisconsin view state ↗ 22 I ▾
- Brown 55009
- Calumet 55015
- Crawford 55023
- Dane 55025
- Door 55029
- Douglas 55031
- Forest 55041
- Kenosha 55059
- La Crosse 55063
- Marinette 55075
- Milwaukee 55079
- Oconto 55083
- Oneida 55085
- Price 55099
- Racine 55101
- Richland 55103
- Rock 55105
- Sheboygan 55117
- Walworth 55127
- Washington 55131
- Waukesha 55133
- Winnebago 55139
§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-2026-05-26
fetched 2026-05-26T20:46:58Z