Water Knotweed

Polygonum amphibium L. - Buckwheat family

Size

Mature Height: Up to around 4.0 feet

Plant Type: Forb/herb

Features

Flower Color: Red, Pink

Bloom Time: Late Spring, Early Summer, Mid Summer, Late Summer

Conditions

Shade Tolerance: Intolerant

Ecosystem Interactions

Pollinators: Native Bees; Bombus; Honey Bees; Beetles, Wasps, Flies; Moths; Butterflies; Larval Host (Butterfly)

Larval Species depending on Water Knotweed: Epidemia helloides, Hyllolycaena hyllus

Native Range

  • USA:  Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, West Virginia, Wisconsin, Wyoming
  • CAN:  Alberta, British Columbia, Newfoundland, Manitoba, New Brunswick, Newfoundland, Northwest Territorie, Nova Scotia, Ontario, Prince Edward I., Québec, Saskatchewan, Yukon
  • MEX:  Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest
Regional Native Status: L48 (N), AK (N), CAN (N), SPM (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.