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Marshpepper Knotweed (Polygonum Hydropiper)

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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Marshpepper Knotweed (Polygonum Hydropiper)
Credit: Carl Axel Magnus Lindman (1856-1928) | «Bilder ur Nordens Flora» Stockholm | License: PD Old PD-Art (PD-old)
  • Marshpepper Knotweed (Polygonum Hydropiper)

Marshpepper Knotweed (Polygonum Hydropiper) Native Growing Regions

Native States for Marshpepper Knotweed (Polygonum Hydropiper)
Alabama, Alaska, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Wisconsin, Wyoming

Marshpepper Knotweed (Polygonum Hydropiper) Information

  • Category: Dicot
  • Genus: Polygonum
  • Family: Polygonaceae
  • Order: Polygonales
  • Class: Magnoliopsida
  • Division: Magnoliophyta
  • Duration: Annual
  • Growth Habit: Forb/herb
  • Native Status: L48 (I) AK (I) HI (I) CAN (I) SPM (I)
  • National Wetland Indicator Status: FACW OBL
  • Regional Wetland Indicator Status: 1(OBL) 2(OBL) 3(OBL) 4(OBL) 5(OBL) 6(OBL) 7(NI) 8(OBL) 9(OBL) 0(OBL) A(FACW*) H(OBL)
  • Active Growth Period: Summer
  • After Harvest Regrowth Rate: Slow
  • Allelopath: No
  • Bloat: None
  • C:N Ratio: Low
  • Coppice Potential: No
  • Fall Conspicuous: No
  • Fire Resistance: No
  • Flower Color: Red
  • Flower Conspicuous: No
  • Foliage Color: Green
  • Foliage Porosity Summer: Moderate
  • Foliage Porosity Winter: Porous
  • Foliage Texture: Medium
  • Fruit/Seed Color: Black
  • Fruit/Seed Conspicuous: No
  • Growth Form: Single Crown
  • Growth Rate: Rapid
  • Height Mature (feet): 1.6
  • Leaf Retention: No
  • Lifespan: Short
  • Low Growing Grass: No
  • Resprout Ability: No
  • Shape and Orientation: Semi-Erect
  • Toxicity: None
  • Adapted to Coarse Textured Soils: Yes
  • Adapted to Fine Textured Soils: Yes
  • Adapted to Medium Textured Soils: Yes
  • Anaerobic Tolerance: Low
  • CaCO3 Tolerance: Low
  • Cold Stratification Required: No
  • Drought Tolerance: None
  • Fertility Requirement: Medium
  • Fire Tolerance: None
  • Frost Free Days Minimum: 120
  • Hedge Tolerance: None
  • Moisture Use: High
  • pH (Minimum): 5
  • pH (Maximum): 7.5
  • Precipitation (Minimum): 24
  • Precipitation (Maximum): 60
  • Root Depth Minimum (inches): 6
  • Salinity Tolerance: None
  • Shade Tolerance: Intolerant
  • Temperature Minimum (°F): 52
  • Bloom Period: Late Spring
  • Commercial Availability: Routinely Available
  • Fruit/Seed Abundance: High
  • Fruit/Seed Period Begin: Summer
  • Fruit/Seed Period End: Fall
  • Fruit/Seed Persistence: No
  • Propagated by Bare Root: No
  • Propagated by Bulbs: No
  • Propagated by Container: No
  • Propagated by Corms: No
  • Propagated by Cuttings: No
  • Propagated by Seed: Yes
  • Propagated by Sod: No
  • Propagated by Sprigs: No
  • Propagated by Tubers: No
  • Seed per Pound: 275000
  • Seed Spread Rate: Moderate
  • Seedling Vigor: High
  • Small Grain: No
  • Vegetative Spread Rate: None

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