Johnston's Knotweed

Polygonum douglasii Greene ssp. johnstonii (Munz) J.C. Hickman - Buckwheat family

Size

Mature Height: Up to around 20 inches

Plant Type: Forb/herb

Features

Flower Color: White, Red, Pink, Green

Bloom Time: Late Spring, Early Summer, Mid Summer

Native Range

  • CAN:  Alberta, British Columbia, Manitoba, Ontario, Québec, Saskatchewan, Yukon
  • USA:  Arizona, California, Colorado, Idaho, Iowa, Michigan, Minnesota, Montana, Nebraska, Nevada, New Hampshire, New Mexico, New York, Oregon, South Dakota, Utah, Vermont, Virginia, Washington, Wyoming
  • MEX:  Mexico Northwest
Regional Native Status: L48 (N), CAN (N)

State-level native status is based on data available through Plants of the World Online. Regional Native Status comes from the USDA Plants Database. For more detailed native status information, please refer to BONAP.