Japanese Knotweed (Polygonum cuspidatum)
Image ID: sj12Tap/mouseover and drag to zoom/pan.
Other common names: Japanese Bamboo
Family: Polygonaceae (Buckwheat)
Height: 3 to 7 ft.
Blooms: August to September
Leaf Type: smooth
Bloom Size: 0.13 in. (typical)
Flower Description: Elongate clusters, Regular blooms, 5 parts
Location: Samuel Justice Trail
More photos of this flower
Folklore, History, and Other Facts
This aggressive invasive plant can grow at a rate of up to four inches per day, and has become a substantial along many trails.
We started out as wildflowers from the bicycle trails of western Pennsylvania, but we've grown!
Meyer, Joseph E. (1918). The Herbalist and Herb Doctor. Hammond, Ind.: Indiana Herb Gardens. 400 pp.