Japanese Knotweed (Polygonum cuspidatum)


Polygonum Cuspidatum, or more commonly know as Japanese Knotweed, is a subshrub forb/herb of the genus Polygonum. Its duration is perennial which means it will grow year after year. Polygonum Cuspidatum or Japanese Knotweed's floral region is North America US Lower 48 and Alaska, specifically in the states of Alaska, Arkansas, California, Colorado, Connecticut, Delaware, Georgia, Iowa, Idaho, Illinois, Indiana, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, Montana, North Carolina, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Utah, Virginia, Vermont, Washington and Wisconsin.

  • Category: Dicot
  • Genus: Polygonum
  • Family: Polygonaceae
  • Order: Polygonales
  • Class: Magnoliopsida
  • Division: Magnoliophyta
  • Duration: Perennial
  • Growth Habit: Subshrub Forb/herb
  • Native Status: L48 (I) AK (I) CAN (I)
  • State Noxious Status: AL (CCW) CA (BW) CT (IB) MA (P) NH (PIS) OR (BDW Q) WA (CBW NWSPQ)
  • State Noxious Common Name: AL (Japanese knotweed Japanese bamboo) CA (Japanese knotweed) CT (Japanese knotweed) MA (Japanese knotweed Japanese arrowroot) NH (Japanese knotweed) OR (Japanese knotweed) WA (Japanese knotweed)
  • National Wetland Indicator Status: UPL FACU
  • Regional Wetland Indicator Status: 1(FACU-) 2(UPL) 3(FACU) 5(FACU) 9(FACU*) 0(NI)

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