Common ragweed, Ambrosia artemisiifolia, plants against blue sky. Ragweed pollen is a seasonal allergen.

- Image ID: AN6CHE
Common ragweed, Ambrosia artemisiifolia, plants against blue sky. Ragweed pollen is a seasonal allergen.
Martin Shields / Alamy Stock Photo
Image ID: AN6CHE
The pollen from ragweed is highly allergenic. It is the primary cause of autumn hayfever seasonal allergies. A common misconception is that goldenrod causes hayfever, but it is insect pollinated so it does not. The pollen from ragweed stamens is carried on the wind

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