The Ohio State University: College of Food, Agricultural, and Environmental Sciences

Japanese knotweed

Japanese knotweed, Reynoutria japonica Houtt.

Leaves: egg-shaped, alternate
Stem: hollow, red to brown color
Nodes: swollen
Flowers: white to green

: Leaves

: Leaves

: Node

: Stem

: Young plant

: Mature plant

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Japanese knotweed