Dormancy

    Large Crabgrass

    Digitaria sanguinalis

    Crabgrass

    Large crabgrass growth habit (Doug Doohan, The Ohio State University, Bugwood.org)

    Crabgrass

    Large crabgrass (Steve Dewey, Utah State University, Bugwood.org)

     
     

    Description

    • clumping grass with horizontal growth (when mowed) or upward growth up to 2 feet tall (when un-mowed)
    • coarse and hairy leaf blades commonly tinged with purple; ligule is very short, jagged and membranous
    • flowers and seeds are produced on whorled spikes (2 to 16 spikes per stalk) and are 2 – 6 inches long

    Location

    • commonly grows in lawn areas and planting beds

    Life Cycle

    • summer annual, warm season grass; seedlings germinate when temperatures reach 55°F and continue to germinate throughout the growing season
    • flowers and seeds appear from mid-summer to first frost

    IPM Recommendations

    • Hand-pull plants in planting beds prior to seed maturation.\
    • Effective control must target both aboveground and underground plant structures; manually remove underground structures to prevent re-sprouting.
    • Shallow tillage or hoeing will control young plants in planting beds. Do not till established plants; root fragments will produce new plants.
    • Apply an appropriate post-emergent herbicide directly to target weeds.