- Scientific name
- Polygonum hydropiper
- Common name
- Knotweed
- Kingdom / family
- Polygonaceae
- Genus
- Persicaria
- Category
- plantae
- Primary role
- weed
- Native regions
- ["Afghanistan","Alabama","Alaska","Albania","Alberta","Algeria","Altay","Amur","Andaman Is.","Angola","Argentina Northeast","Argentina Northwest","Argentina South","Arizona","Arkansas","Ascension","Assam","Austria","Azores","Bahamas","Baleares","Baltic States","Bangladesh","Belarus","Belgium","Belize","Benin","Bermuda","Bismarck Archipelago","Bolivia","Borneo","Botswana","Brazil Northeast","Brazil North","Brazil Southeast","Brazil South","Brazil West-Central","British Columbia","Bulgaria","Burkina","Burundi","Buryatiya","California","Cambodia","Cameroon","Canary Is.","Cape Provinces","Cape Verde","Caprivi Strip","Caroline Is.","Cayman Is.","Central African Republic","Central European Russia","Chad","Chatham Is.","Chile Central","Chile North","Chile South","China North-Central","China South-Central","China Southeast","Chita","Colombia","Colorado","Comoros","Congo","Connecticut","Corse","Costa Rica","Cuba","Cyprus","Czechia-Slovakia","DR Congo","Delaware","Denmark","Desventurados Is.","District of Columbia","Dominican Republic","East Aegean Is.","East European Russia","East Himalaya","Easter Is.","Ecuador","Egypt","El Salvador","Eritrea","Eswatini","Ethiopia","Finland","Florida","France","Free State","French Guiana","Føroyar","Gabon","Galápagos","Gambia"]
- Invasive regions
- ["Cook Is.","Falkland Is.","Fiji"]