Orange hawkweed

(Hieracium aurantiacum)

Description

  • Bright orange, orange-red, or yellow flowers with several flower heads growing in clusters
  • Stems are usually single, unbranched and leafless
  • A rosette of leaves is present at the base of the plant (native hawkweeds will have true leaves growing all the way up their stems)
  • Stems are covered in black hairs
  • 0.3 – 1.2m tall

Consequences of invasion

  • Invasive hawkeed species can replace native vegetation in open, undisturbed natural areas
  • Reduces forage and threaten biodiversity
  • Outcompetes forage plants in hay fields and pastures

Integrated Pest Management Options

  • For small infestations, dig out rosettes and their shallow roots and dispose in clear plastic bags for free
  • Can reproduce vegetatively through above ground runners, and underground roots, so take care to securely remove all of these parts.
  • Mowing removes flower stems and may prevent seed set, but it should be used with caution as it encourages vegetative spread
  • Large infestations may be treated with a high nitrogen fertilizer
  • Minimize soil disturbance and promptly revegetate disturbed areas
  • Become Plantwise and learn about Grow Me Instead

Additional Resources:

Orange Hawkweed Fact Sheet | ISCBC

Orange Hawkweed | Alberta Invasive Species Council