Prostrate Knotweed

Prostrate Knotweed is a dense spreading summer annual.  This weed germinates early in the spring.  This weed produces a shallow taproot and multiple creeping stems.  This broadleaf weed can produce thick patches up to three feet wide from one plant.  This broadleaf weed grows best where most turf grass won’t grow.  This weed thrives in dry, compacted and highly trafficked areas.  This weed produces small pink flowers where the stem and the leaf of the plant meet.  This plant flowers in late spring.  The leaves of this plant will grow up to 1″ long and up to 1/3″ wide.  If the plant is not mature, the leaves will tend to be smaller.  This spreading weed reproduces by seed.

Prostrate knotweed in grass.

Prostrate Knotweed

Prostrate knotweed close up

Prostrate Knotweed Close Up

Prostrate Knotweed in a Crack

Knotweed in Cracks

Prostrate Knotweed

Polygonum Aviculare


Treat this plant with a selective broadleaf herbicide when the plant is actively growing.

Similar broadleaf weeds.

  • Purslane
  • Spotted Spurge

Click here for other Prostrate Knotweed identification sources.