Knotgrass

Polygonum aviculare



Knotweed, Iron-weed, Iron-grass, Wire-grass, Wire-weed

Importance

Found in spring cereals and well spaced vegetable crops.

Knotgrass - young1. The cotyledons are narrow and long, borne on a short reddish stem.
Knotgrass - mature2. The first true leaf is broad at the base, long and lance-shaped.
Knotgrass 33. This is an annual and the older plant has long leaves and a prostrate wiry growth habit.