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  • Noxious Weed Identification List

    Houndstongue


    (Cynoglossum officinale) 

    Info Sheet Adobe PDF Icon  

    Colorado List B - Control required in Jefferson County

    General

    • Family: Boraginaceae
    • Biennial (short-lived perennial)
    • Rosettes form the first year and bolt early in May to June of the next year
    • Contains alkaloids that are poisonous to livestock
    • Native to Eurasia

     

    Habitat

    • Disturbed areas, pastures, rangelands, roadsides and right-of-ways up to 9,000 feet elevation

     

    PLANT

    Vegetation

    • Mature plants are 1 1/2 to 3 feet tall
    • Leaves are hairy, 1 1/2 inches long and 1 to 3 inches wide

     

    Roots

    • Black, woody taproot

     

    Flower

    • Color: reddish-purple
    • Season: May through July
    • Size: 1/4 to 1/2 inch wide
    • Produces up to 2,000 seeds

     

    Seed

    • Seeds left on the plant may remain viable for 2 to 3 years

     

    Seedling

    • Rosettes form the first year

     

    Reproduction

    • Seed

     

    CONTROL

    Biological

    • None

     

    Chemical

    • Apply one of the following during rosette or mid-bolt through late-bud stage (spring): 
      • Banvel; or
      • 2,4-D; or
      • Ally, Escort; or
      • Telar; or
      • Tordon (restricted-use pesticide)

     

    Use all chemicals according to the manufacturer's label. Listing the above methods or products does not imply a specific recommendation or endorsement.

     

    Cultural

    • Prevention – maintain health of site
    • Removal

     

    Mechanical

    • Burning - N/A 
    • Grazing - Should not be grazed because it is poisonous to livestock 
    • Mowing - Second-year plant before seed production 

     



    Alicia Doran
    Weed & Pest Management Specialist
    303-271-5989
    adoran@jeffco.us

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    weed-pest-b-houndstongue-plant

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    Last Updated: 7-30-2013