University of Maryland Extension

Horseweed

Horseweed
Conyza canadensis

horseweed

Life cycle: annual, germinating in fall or spring
Growth habit: erect 3 to 6 ft. tall, generally unbranched except at top; leaves long and narrow with toothed margins, hairy, whorled around hairy stems
Reproduction: seeds spread by wind; many small, white ray and yellow disk flowers
Conditions that favor growth: primarily a weed of nursery crops and orchards, perennial crops, waste areas and fallow fields
Cultural control: manual cultivation or maintain regular mowing to prevent flowers and seed production

 

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