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

Hoary cress

Cardaria draba

Description

  • 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

  • Found in the Columbia Gardens, Warfield and Rossland area, hoary cress is classified as Contain for the Lower Arrow Invasive Plant Management Area (IPMA) on the CKISS Annual Priority List.
  • As hoary cress has a very limited distribution in IPMAs outside of the Lower Arrow region, it is classified as Regional EDRR for those IPMAs.
  • CKISS is taking measures to monitor for hoary cress in those areas, with the goal of eradication if it is detected.
  • 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