Ragweeds are flowering plants in the genus Ambrosia in the sunflower family Asteraceae. Common names include bitterweeds and bloodweeds. Each plant is reputed to be able to produce about a billion grains of pollen over a season, and the plant is anemophilous (wind-pollinated). It is highly allergenic, generally considered the greatest allergen of all pollens, and the prime cause of hay fever in North America. Common Ragweed (A. artemisiifolia) and Western Ragweed A. psilostachya are considered the most noxious to those prone to hay fever. Ragweeds bloom in the Northern Hemisphere from early July until mid-August or until cooler weather arrives.
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