Characteristics: Giant ragweed is an annual, warm-season forb native to North Ameeaches six feet. Thick green stems are covered with stiff white hairs, which make them very coarse to touch. Leaves can vary in shape depending on size. New leaves are often lanceolate, becoming divided into three or five lobes when mature. The three-lobed pitchfork-shaped leaf is often the greatest distinguishing characteristic for this plant. Leaf margins are usually serrated. Many of the upper stems terminate in a cylindrical spike of yellowish green flowers in August to October. Another common name of this plant is bloodweed because of the reddish purple sap apparent when stems are rubbed or broken.
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