Definition of ragweed in English:



  • A North American plant of the daisy family. Its tiny green flowers produce copious amounts of pollen, making it a major causative agent of hay fever in some areas.

    • ‘Occasionally, broadleaf weeds, such as Canada thistle or ragweed, become established in winter wheat fields and interfere with grain harvest or with the following soybean crop.’
    • ‘It is wind-born pollen from plants that have inconspicuous flowers like wild grasses or ragweed that are the major causes of respiratory allergy.’
    • ‘Many early emerging summer annuals, including giant ragweed, kochia, crabgrass, lambsquarters, and Russian thistle, are removed during tillage, allowing the crop and any new weeds to emerge together.’
    • ‘It's used to get rid of dandelions, thistles and ragweed and it kills by causing abnormal cell growth that interrupts the movement of liquids and nutrients in the plant.’
    • ‘People who have known sensitivities to ragweed may experience reactions to chamomile and should use caution.’