Japanese Knotweed

Reynoutria japonica

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Polygonaceae
Genus:
Reynoutria
Species:
Reynoutria japonica

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb , Subshrub
Height:
8-12 ft
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
jun, jul, aug, sep, oct, nov
Bloom Colors:
white

Native Range

United States: Alaska, Arkansas, California, Colorado, Connecticut, District of Columbia, Delaware, Georgia, Iowa, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Minnesota, Missouri, Mississippi, Montana, North Carolina, Nebraska, New Hampshire, New Jersey, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Utah, Virginia, Vermont, Washington, Wisconsin, West Virginia, Canada: British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec

Reported Fauna Sightings

Bees: Common eastern bumble bee (Bombus impatiens), Common eastern bumble bee (Bombus impatiens)

Soil Requirements

Soil Type:
moist, fertile, well-drained loam
pH:
5.0 - 7.0 (slightly acidic to neutral)
Drainage:
tolerates poor drainage
Moisture:
consistently moist
Notes:
thrives in disturbed areas with rich organic matter