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 lambsquarters (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.

Pigweed pollen is most prevalent from March through October.

Pigweed Allergy Information

Pigweed is a plant that belongs to the Amaranthaceae family and is native to North America. It is also known as Amaranthus, and there are over 60 different species of pigweed that are found worldwide. Pigweed is an annual plant that can grow up to 6 feet tall and has a reddish stem with green leaves that are shaped like a diamond. It produces small green flowers that bloom in the summer and fall.

Pigweed can grow in a variety of habitats, including fields, gardens, and roadsides, and it can thrive in both rural and urban environments. According to the United States Department of Agriculture (USDA), pigweed is most prevalent in the following states:

  • Arkansas
  • Missouri
  • Mississippi
  • Tennessee
  • Louisiana

Pigweed pollen is a common allergen that affects many people, particularly during the summer months. The pollen is produced by the male flowers of the plant and is carried by the wind. The peak allergy season for pigweed typically occurs during the late summer and early fall months, usually from July to September, although it can vary depending on the specific location and climate.

If you experience symptoms of a pigweed pollen allergy, it is important to see an allergist for proper diagnosis and treatment. Treatment options may include antihistamines, nasal corticosteroids, and allergy drops or shots.

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