Weeds: Prostrate knotweed – Polygonum aviculare

categories: Pr-Sc Weeds

revision date: 2024-06-22 10:55

  • Family: Polygonaceae
  • Cycle: Annual
  • Plant type: Broadleaf
Prostrate knotweed leaves.
Prostrate knotweed leaves
Photo by: R. Parker


Prostrate knotweed is a low-growing plant with wiry stems and a thin taproot. Plants branch extensively at the base, with branches lying along the ground but not rooting. The alternate, blue-green leaves are narrow, typically not exceeding an inch in length and 1/4 inch in width. Leaf tips may be slightly pointed to rounded in outline. The petioles are very short. The greenish-white flowers are borne in leaf axils and are inconspicuous.


Prostrate knotweed is commonly found on compacted soils and may occur on waste areas, or in lawns, paths, and other areas in yards. It is frequently a problem on compacted or high-traffic areas in lawns.

Management Options

Use Integrated Pest Management (IPM) for successful plant problem management.

Non-chemical Management

Select non-chemical management options as your first choice!

  • Cultivation (rototilling or hoeing) will effectively eliminate plants.

Chemical Management

IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.

  • Apply according to label directions.
  • Glyphosate products should be applied as spot treatments only!
  • NOTE: Some ingredients listed here are only available in combination.
  • Read the label carefully on combination products to make sure the product is suitable for your specific situation.

Landscape areas

  • dichlobenil
  • glyphosate
  • products containing diquat
  • trifluralin

Turf areas

  • 2,4-D + MCPP + dicamba

Bare ground areas

  • dichlobenil
  • glyphosate
  • products containing diquat

Additional Images