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Extension > Garden > Diagnose a problem > Is this plant a weed? > Grass > Smooth Crabgrass

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Smooth Crabgrass

Digitaria ischaemum Schreb. ex Muhl

  • Image: broadleaf Plantain
  • Image: broadleaf Plantain

Found in:

  • Lawns and landscape beds


  • Annual grass that grows best during warm weather (summer)
  • Low growing and spreading
  • Leaf blade is flat with prominent midrib; hairless on upper and lower surfaces
  • Older sheaths and leaves can become dark reddish to maroon in color
  • Flower head consists of 2-10 finger-like spikelets
  • Spikelets are dark purple at maturity
  • Roots are fibrous; no underground stems (rhizomes) produced


  • Maintain minimum 2 1/2 - 3” mowing height and good turfgrass density

Plants that look similar:

More information and control options for Smooth Crabgrass

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