All Species

Perennial Sowthistle

Sonchus arvensis
Michael Rasy, University of Alaska, Bugwood.org

Why is it a Problem?

  • Dense populations can significantly reduce water availability for other plants
  • Hosts a number of plant pests
  • Can slow the establishment of native plants
  • Each plant produces 4,000-13,000 seeds that are spread by wind
  • Seeds may remain dormant in the soil for up to 6 years
  • Quickly invades new areas by spreading roots

How do I Manage this Plant?

  • Manual (e.g., hand-pulling or digging) and mechanical methods (e.g., mowing) reduce seed production and weaken root system
  • Manual and/or mechanical control methods should be repeated several times each season for multiple years
  • Plants are resistant to many herbicides

More info on species biology

Seedhead and flower detail: Laval University, CC BY-SA 4.0, via Wikimedia Commons