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Japanese Knotweed

Polygonum cuspidatum

Polygonaceae · broadleaf · introduced

Last updated

Data Coverage 1 of 6 dimensions
Site Data
Threats
Cultivars
Phenology
GDD Thresholds
Puget Sound

Quick Facts

Height
4–8 ft
Growth Rate
Rapid
Light
Full Sun
Soil
Moist
Hardiness
Zone Zones 4a–8b
Bloom Time
fall, summer
Origin
Asia