Annual plant Polygonum aviculare of the dock
family, growing on bare ground including
seashores. Often low-growing, but with stems
up to 2m /6 ft long, the small lance-shaped
leaves have bases that sheathe the stem,
giving a superficial resemblance to grass.
The small pinkish flowers grow in small
clusters in the leaf axils in late summer,
followed by seeds which are a favourite with
birds. Knotgrass grows worldwide except in
the polar regions.