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  • Noxious Weed Identification List

    Common Mullein


    (Verbascum thapsus)

     Info sheet Adobe PDF Icon

     

    Colorado List C – Control recommended

    General

    • Family: Scrophulariaceae (Figwort)
    • Biennial
    • Introduced from Europe

     

    Common names

    • Wooly Mullein

     

    Habitat

    • Found in rangeland, pastures, open areas, disturbed sites and roadsides

     

    PLANT

    Vegetation

    • Mature plants grow up to 8 feet tall
    • Leaves oblong, blue-green, hairy, up to 5 inches wide and 12 inches long
    • Leaves get smaller as they grow up the flower stalk

     

    Roots

    • Tap root and fibrous secondary roots

     

    Flower

    • Color: yellow
    • Season: June to September
    • Size: about 1 inch wide; tightly grouped flowers at the end of a stalk up to 6 feet tall

     

    Seed

    • Up to 180,000 seeds per plant
    • Seeds last up to 100 years in the soil

     

    Seedling

    • Rosette

     

    Reproduction

    • Seed

     

    CONTROL

    Biological

    • Gymnetron tetrum, seed weevil

     

    Chemical

    Apply one of the following during rosette stage (spring or fall):

    • Milestone  or
    • Tordon 22K (restricted-use pesticide) plus 2,4-D 

     

    Apply the following during rosette to early bolt stage:

    • Telar 

     

    Apply the following when plants are actively growing:

    • RoundUp  

     

    Cultural

    • Prevention – maintain health of site
    • Revegetation of highly disturbed sites
    • Removal – flower and seed stalks should be bagged and disposed

     

    Mechanical

    • Burning - Not recommended; fire encourages plants to germinate 
    • Grazing - Not recommended; most animals will not feed on the plant 
    • Mowing - Not recommended; plants will regrow multiple stems and set seed 

     

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



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

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    weed-pest-c-common-mullein-seedhead

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    Last Updated: 7-29-2013