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