Knotweed is a sprawling, wiry, broadleaf annual weed that rarely grows over a few inches high. Tiny, oval, bluish-green leaves are ¼ inch wide and 1 inch long. Flowers are small and inconspicuous, whitish-green and born in leaf axils in fall. Knotweed can form a thick mat, up to 3-feet in diameter, choking out desirable lawns and plants.


Knotweed is found throughout the United States, especially in compacted soils.

Related or Similar Plants

Prostrate Knotweed, Knotgrass, Doorweed, Matgrass