Hoary Cress (Cardaria draba)
Hoary cress (Cardaria draba)

Hoary cress

(Cardaria draba)


  • Native to Europe and Asia.
  • Long-lived perennial.
  • In the Mustard family.
  • White flowers, with four petals.
  • Requires full sun and moderately moist to dry soil.
  • Deep vertical taproots and horizontal, rhizomatous roots.
  • Reproduces by seed (1000 to over 4000 per plant) and roots.
  • Found in the Columbia Gardens, Warfield and Rossland area.

Consequences of invasion

  • Invades rangelands and pastures, impacting livestock.
  • Livestock will not eat hoary cress.
  • Milk and meat can be tainted if the plant is eaten by stock, condition persists for a week.
  • Highly competitive, outcompetes native vegetation in rangelands.
  • Decreases crop yields.

Integrated Pest Management Options

  • Pull or dig small infestations when soil is moist.
  • Proper pasture and rangeland management, minimizing soil disturbance and overgrazing.
  • Chemical control may work on larger infestations.

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