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Pigweed is an annual herb that grows throughout the U.S. in agricultural fields and recently disturbed soils. Plants grow to 28 feet tall, and leaves are a dull green. The flowers are dense, and sometimes showy. In pollen counts, pigweed is often interchanged with the plant called lamb’s quarters (Chenopodium) for a few reasons. Flowering and pollen shed occurs at the same time and the pollen grains look the same to analysts conducting pollen counts through their microscopes. Common names for these plants are also used interchangeably depending on where you are in the country. Late summer to autumn is usually the peak time for the sparce pollen shed.

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Learn more about all the seasonal allergies below

Ash tree allergen
Box Elder
Cedar tree allergen
Cottonwood Tree
Dust mite allergen
Elm tree allergen
Grass allergy
Mold spores
Mulberry tree allergen
Oak tree allergen
Palm tree allergen
Pecan tree allergen
Pigweed Allergen
Pine tree allergen
Ragweed allergen