Scientific Name: Cynoglossum officinale
Common Name(s): Hounds Tongue
Origin:Native to Eurasia
Introduced to North America in cereal seed
in 1922

  • biennial taprooted weed growing 0.5 to 1.2 metres tall
  • soft, hairy rosette leaves (7 to 30 cm long)
  • in first year resemble the shape of a dog's tongue
  • stem leaves are shorter and stalkless
  • dull reddish-purple flowers
  • bears 4 rounded triangular seeds that are covered with hooked prickles
  • contains toxic alkaloids that can cause liver damage in grazing animals
  • easily spread by seed attachment to clothing and animals hounds_toung_seeds.jpg
  • thrives especially well on openings in the forest cleared by logging operations and road construction


  • pastures, roadsides, meadows and forested areas in B.C
  • Empire Valley-Dog Creek area, the Thompson-Nicola, Okanagan-Boundary and East Kootenay regions

Control/ eradication recommendations:

  • no biologic agents have yet been approved for release against hound's-tongue in North America, research is underway in Europe
  • Tordon 22K, Banvel and 2,4-D Amine. Tordon 22K applied in spring, summer or fall for chemical control