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Canada Thistle: Perennial <br /> Characteristics: Grows from ground stage to flower head production in one season.Stays viable in the roots over <br /> winter and bolts again in the spring :, * <br /> Rosette Flower Head <br /> Mature Plant <br /> Methods of Control: <br /> -Chemical:Plants should be sprayed prior to seed head production(Early Spring),follow uptreatments may be <br /> required as the plant has an extensive root system and can resprout. <br /> -Manual: If flower heads are present clipping and bagging flower heads then sprayingthe plant can prevent seeds from <br /> contaminating site. <br /> -Mechanical:consistent trimming on new growth of plant prior to seed production can exhaust it's energy reserves. <br /> Effective Herbicides:Application rates should be derived from product labels specific to weed species and tank <br /> mix,additional products may be used but should be a selective broad leaf herbicide to avoid damage to <br /> desirable grasses) <br /> 2,4-D Amine <br /> Telar XP(Chlorsulfron) <br /> Milestone Amino ralid <br /> Figure2.Specific practices for the control of Canada Thistle. <br />