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

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.

Status in the CKISS region

  • There are established populations in the Lower Arrow Invasive Plant Management Area (IPMA). The goal is to contain currently infested areas and to not allow further spread.
  • Hoary cress has not been found in the Kaslo or Nakusp IPMAs, but has been found with a very limited distribution in other parts of the region.
  • If you notice this plant growing outside of its containment area, please report it!
  • To learn more about how CKISS classifies and manages invasive species, see our Invasive Species Priority Lists page.

Integrated pest management options

  • Use the PlantWise resource to choose non-invasive plants for your garden.
  • 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.

Additional resources