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Ragweed photoSummer annual, 0.2-2.5 m tall, found throughout the United States, producing abundant pollen that is a primary cause of hay fever.

  • There are 17 species of ragweed in North America.

  • Ambrosia is the generic name of ragweed and in the Latin means "food of the gods."

  • Ragweed grows the best in sunny, newly-disturbed soils, free from competition with other weeds and grasses. It is often found along roadsides, vacant lots, river banks, and abandoned fields.

  • Ragweed starts blooming in the north about mid-August as the days become shorter and the nights longer. Pollen production ends mid-September as temperatures start dropping below 60 °F.

  • It is estimated that one ragweed plant can produce up to 1 billion pollen grains.


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