Annual Weeds
STARTHISTLE, YELLOW Centaurea solstitialis Life Cycle: Annual Plant Description:
An annual (occasionally biennial) weed, yellow starthistle forms a rosette in the fall. However, seedlings also can emerge in the spring. Plants elongate in the spring and summer with multiple flowering stalks. The stems are winged and branched. The grayish-green stems and leaves are covered with woolly hair. Flowers are bright yellow with a base of spines 1/4 to 2 inches long. Treatment: Apply 16 fluid ounces of HighNoon ® herbicide per acre. Apply at the
rosette through bolting stages when soil moisture is adequate to support plant growths. Use higher rate when weeds are larger.
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