Japanese Knotweed
Reynoutria japonica
- Native to:
- China, Hainan, Japan, Korea, Kuril Is., Nansei-shoto, Taiwan
W.carter
Taxonomy
- Division:
- Magnoliophyta | - Flowering plants
- Family:
- Polygonaceae
- Genus:
- Reynoutria
- Species:
- Reynoutria japonica
- USDA Symbol:
- POCU6
Growth Characteristics
- Life Cycle:
- Perennial
- Growth Habit:
- Forb/herb , Subshrub
- Height:
- 300 cm
- Light Requirements:
- Full Sun
- Drought Tolerance:
- Medium
- Bloom Months:
- aug,sep,oct
- Bloom Colors:
- white, cream
Reported Fauna Sightings
Bees: Common eastern (Bombus impatiens), ⚠️Western honey bee (Apis mellifera) Moths:Psyche casta Butterflies:Red-banded Hairstreak (Calycopis cecrops)
Garden & Ecology Notes
- Wildlife Value:
- bees
- Deer Resistant:
- Yes
- Salt Tolerant:
- Yes
- Fire Ecology:
- Fire adapted — tolerates or benefits from fire
- Fire Notes:
- Resprouts vigorously from extensive rhizome system after cutting or burning; fire does not effectively control this species.
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