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Extension > Garden > Diagnose a problem > Is this plant a weed? > Broadleaf Weeds > Creeping > Prostrate Knotweed

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Prostrate Knotweed

Polygonum aviculare L.

  • Image: broadleaf Plantain
  • Image: broadleaf Plantain
  • Image: broadleaf Plantain

Found in:

  • Lawns, landscape beds, disturbed soils; common on compacted soils


  • Early germinating annual with wiry, mat-like growth habit
  • Seedlings look almost grass-like
  • Leaves are small, narrowly oval and blue-green in color, arise alternately along stem
  • Each node (joint) has a swollen or knotted appearance with a papery tissue like structure (ochrea) surrounding the node
  • Small white flowers appear June to late fall
  • Long, thin tap root


  • Germinates early to mid-April and throughout spring
  • Often considered an indicator plant for compacted soils

Plants that look similar:

More information and control options for Prostrate Knotweed

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