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Alberta Invasive Species Council – Prevention inspired. Alberta protected.
Don’t Let it Loose: Be a Responsible Pet Owner
Read More
Plantwise: Alternatives For Your Garden
Read More
Clean, Drain, Dry Your Gear
Read More
Buy It Where You Burn It: Don’t Move Firewood
Read More
Play, Clean, Go: Protect Our Outdoors
READ MORE
Report Invasive Species: EDDMapS Alberta
READ MORE
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • Don’t Let it Loose: Be a Responsible Pet Owner
  • Plantwise: Alternatives For Your Garden
  • Clean, Drain, Dry Your Gear
  • Buy It Where You Burn It: Don’t Move Firewood
  • Play, Clean, Go: Protect Our Outdoors
  • Report Invasive Species: EDDMapS Alberta

INVADER ALERT

  • Orange hawkweed is a member of the Aster Family native to Europe. It is a fibrous rooted, perennial herb with a milky latex in the stems and leaves. Hawkweeds reproduce by seeds and vegetatively by numerous horizontal stolons, and rhizomes underground. Non-native hawkweeds exhibit many characteristics of an invasive plant: high seed production and germination rates, asexual seed production, wind-dispersed seed, vegetative reproduction via rhizomes, stolons, and root fragments, and rapid growth.
  • Hawkweeds develop a low rosette of basal leaves before producing a flowering stem. Dandelion-like flowers are borne at the ends of stems. Orange hawkweed is unique among both native and introduced hawkweeds in that flowers are a fiery orange colour. All other hawkweed are yellow flowered and there is one white flowered species.
  • Stems: Are erect, usually solitary, and leafless or with leaves or with just 1 or 2 greatly reduced leaves. Stems bear numerous stellate, glandular, and simple hairs. Plants grow 10-60 cm. Stolons are present and hairy. Leaves: Basal leaves are oblong/lanceshaped to elliptic, and narrow to a petiole, and 4-20 cm long 1-3.5 cm wide. The upper leaf surfaces bear numerous simple hairs and the lower surfaces bear both simple and stellate hairs. Leaf margins may be entire or slightly toothed. Flowers: Red-orange ray flowers are borne in open, rounded clusters of 20-50. Involucral bracts are lance-shaped, 5-8 mm tall, with numerous stellate, blackish glandular, and simple hairs. Achenes are narrowed at the base, 1.5-2 mm long, with a brownish pappus.
  • Hawkweeds prefer well drained, coarse textured soils, moderately low in organic matter, in mesic habitats. It can successfully grow under coniferous forest canopy. Seeds are produced by apomixis - asexually - as nonnative hawkweeds are polyploids (n=9), as opposed to the native diploid hawkweeds. Occasional sexual reproduction occurs.
  • Learning to recognize hawkweeds from the many yellow-flowered members of the Aster family is key to prevention. Hairs are an important characteristic of non-native hawkweeds and also in distinguishing between species. Long term management of hawkweeds requires maintaining healthy forbs and grasses - fertilization of desirable vegetation can result in out-competition of hawkweeds. Re-seed disturbance in areas susceptible to hawkweed invasion. Mowing before flowering will prevent seed production of taller plants but will not inhibit reproduction via stolons and rhizomes. Hand digging of small infestations where all stolons and root can be removed may be effective. Root fragments can generate new plants; therefore, any mechanical tilling/cultivation would be ineffective. Hexazinone, 2,4-D, and glyphosate are registered for use on Hieracium spp./hawkweeds. Always check product labels to ensure the herbicide is registered for use on the target plant in Canada by the Pesticide Management Regulatory Agency. Consult your local Agricultural Fieldman or Certified Pesticide Dispenser for more information.