As you drive down the highway in late summer or early fall, past wildflowers, grasses and weeds,
it may not occur to you that lurking among the vegetation may be the most potent and widespread
cause of allergy symptoms.
Ragweed
Ragweed, a tall, branched plant, is native to North America and found throughout the lower
48 states on dry fields, pastures, roadsides and construction sites.
Ragweed has 15 different species throughout the United States.
The plants usually release pollen in the late summer.
The giant ragweed, meanwhile, can reach up to 17 feet in height, and is native from
Quebec to British Columbia in Canada and southward to Florida, Arkansas and California
in the USA.
The ragweed/composite family includes sunflowers, daisies and mugwort.
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