Knotgrass or knot grass is the common name for several plants and a moth and may refer to:

• Paspalum distichum , a species of grass
• Polygonum , a genus of plants in the buckwheat family, more often known as knot weed
• Acronicta rumicis , a moth of the family Noctuidae

See also

• Knotweed

Index of plants with the same common name

This page is an index of articles on plant species (or higher taxonomic groups) with the same common name (vernacular name).
If an internal link led you here, you may wish to edit the linking article so that it links directly to the intended article.