Polygonum Hydropiper, or more commonly know as Marshpepper Knotweed, is a forb/herb (a forb/herb is a non-woody plant that is not a grass) with green foliage and red flowers of the genus Polygonum. It has a rapid growth rate and a height of 1.6 feet at maturity. Its duration is annual which means it grows for one season only. It's active growth period is summer, blooms during late spring and is intolerant of shade. Polygonum Hydropiper or Marshpepper Knotweed's floral region is North America US Lower 48, Alaska and Hawaii, specifically in the states of Alaska, Alabama, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Iowa, Idaho, Illinois, Indiana, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, Montana, North Carolina, North Dakota, Nebraska, New Hampshire, New Jersey, Nevada, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Vermont, Washington, Wisconsin and Wyoming.
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