Common burdock (Arctium minus)

Common Burdock

Arctium minus

Description

  • Prefers areas with soil moisture and fertile soils, and thrives where there has been recent disturbance.
  • First year growth forms a rosette with large, hairy heart shaped leaves which shade out smaller vegetation.
  • The leaf edges are wavy and can be toothed, dark green on top and fuzzy underneath.
  • In its second year, common burdock can reach up to 3m in height. The flowers of common burdock are purple and show in short clusters along the stems.

Introduction and spread

  • The prickly seed heads of burdock are designed to attach and travel on passers-by for dispersal.
  • This seeds of plant can easily by spread by attaching to clothing, boots or pets fur.

Consequences of invasion

  • Bats and birds can become tangled in the burrs of burdock and can to lead to death.
  • Burrs can also become stuck in the wool and hair of farm animals. If burdock does become entangled in the wool of a sheep, it devalues it.

Status in the CKISS region

  • Burdock has become widespread in the CKISS region, and is classified as Established on the CKISS Annual Priority List.
  • While it is not realistic to eradicate this species at the landscape level, this species may be treated at high priority sites (e.g. wildlife habitat, corridors of spread, adjacent to agricultural land, restoration sites, etc.) based on specific land management objectives.
  • To learn more about how CKISS classifies and manages invasive species, see our Invasive Species Priority Lists page.

Integrated pest management options

Prevention

  • Avoid soil disruption wherever possible.
  • If the soil is disturbed, re-seed and encourage the growth of competing vegetation.
  • Be PlantWise to avoid spreading burdock.

Mechanical treatment

  • In order to prevent the spread of burdock it is important not to let the plant go to seed. Mowing and cutting can be effective after the plant has bolted, but before it flowers.
  • When burdock is in its first year, tilling the soil can reduce growth as it is intolerant of cultivation.

Chemical

  • Certain chemical controls can be used on burdock, consult a professional.

Biological

  • There is currently no biological control available for common burdock.

Additional resources