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Report an Invasive Species

Hoary alyssum

Hoary alyssum

Hoary alyssum

(Berteroa incana)

Priority: -  Contain

Tags: Terrestrial | Toxic

Identification and Reproduction

 Identification

  • Annual to short-lived perennial
  • Taproot
  • Branches covered in hairs 
  • Leaves are greenish-grey, lower stems are purple 
  • Can over-winter as a rosette, then emerge again in spring
  • Small white flowers, deeply “notched” petals 
  • Shink stalks
  • Seedpods are oval-shaped, have 5-7 black seeds 
  • Stems will grow as high as 0.7 metres 

 

Reproduction

  • Seeds spread by people, equipment, wildlife



Habitat & Ecology

  • Establishes in sandy and gravelly soils, pastures 
  • Long seed production season 
  • Stems will grow as high as 0.7 metres 

Impacts

  • Invades forage, range
  • Toxic, harmful to horses, which can be very problematic



Management

  • Removal of entire root crown; burning of mature plant

Resources

https://bcinvasives.ca/invasive-species/identify/invasive-plants/hoary-alyssum

http://www.oasiss.ca/pdfs/Hoary%20Alyssum_updated%202014.pdf

https://abinvasives.ca/wp-content/uploads/2017/11/FS-Hoary-Alyssum.pdf

https://commons.wikimedia.org/wiki/File:P1010448-Berteroa-incana.JPG