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  • Noxious Weed Identification List

    Sulfur Cinquefoil


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    Info Sheet Adobe PDF Icon 

     
    Colorado List B - Control required in Jefferson County

    General

    • Family: Rosaceae (Rose)
    • Perennial forb
    • Introduced from Europe

     

    Habitat

    • Found in pastures, rangelands, roadsides, grasslands, shrubby areas, open forest and logged areas, waste areas and other disturbed sites
    • May live 20-plus years

     

    PLANT

    Vegetation

    • Mature plants grow up to 3 feet tall
    • Leaves have 5 to 7 leaflets shaped like a palm; green on top and bottom with toothed edges
    • Leaf stalks and stems have perpendicular hairs; hairs may not remain on older plants
    • Very few basal leaves, but stems have many leaves
    • Single to multiple stems grow from a root crown

     

    Roots

    • Tap root and shallow spreading roots

     

    Flower

    • Color: pale yellow
    • Season: May to July
    • Size: 3/4 to 1 inch wide
    • Five heart-shaped petals with five green sepals and five bracts below
    • One to several flowering stems, branched at the inflorescence, with a central stalk and two opposite branches at each node forming a somewhat flat-topped group

     

    Seed

    • Seeds are brown, small, comma-shaped and covered with net-like veins

     

    Reproduction

    • Seed and vegetative

     

    CONTROL

    Biological

    • None

     

    Chemical

    Apply the following during the flowering stage (spring or fall):

    • Picloram (Tordon 22K – restricted-use pesticide) 

     

    Apply the following during the pre-bud or early flower stage (late spring to early summer):

    • Aminopyralid (Milestone)  

     

    Cultural

    • Prevention – maintain health of site using good grazing management and keeping good cover
    • Removal of young plants

     

    Mechanical

    • Burning - Not recommended 
    • Grazing - Not effective; animals avoid grazing because the plant contains tannins; overgrazing allows plants to spread 
    • Mowing - Not recommended 

    More Information

     

    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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    Last Updated: 7-31-2013