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Cultivated Knotweed (Polygonum polystachyum)

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Polygonum Polystachyum, or more commonly know as Cultivated Knotweed, is a forb/herb (a forb/herb is a non-woody plant that is not a grass) of the genus Polygonum. Its duration is perennial which means it will grow year after year. Polygonum Polystachyum or Cultivated Knotweed's floral region is North America US Lower 48, specifically in the states of California, Massachusetts, Montana, Oregon and Washington.

  • Category: Dicot
  • Genus: Polygonum
  • Family: Polygonaceae
  • Order: Polygonales
  • Class: Magnoliopsida
  • Division: Magnoliophyta
  • Duration: Perennial
  • Growth Habit: Forb/herb
  • Native Status: L48 (I) CAN (I) SPM (I)
  • State Noxious Status: CA (BW) OR (BDW Q) WA (CBW NWSPQ)
  • State Noxious Common Name: CA (Himalayan knotweed) OR (Himalayan knotweed) WA (Himalayan knotweed)
  • PLANTS Invasive Status: STATE
  • National Wetland Indicator Status: FAC
  • Regional Wetland Indicator Status: 1(NI) 9(FAC) 0(FAC*)




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