Invasive Plants That Can Also Trigger Allergies

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Most flowering plants that spread their pollen by insects do not cause allergies. Weeds, grasses, and trees are the primary sources of pollen that can cause allergies. An allergy to pollen is called allergic rhinitis, more commonly known as hay fever.

Wyndly compiled a list of 10 invasive species and outlined how they impact seasonal allergies, citing data from the U.S. Department of Agriculture and Invasive Species Atlas.

Dalmatian Toadflax

– Scientific name: Linaria dalmatica – Native habitat: Mediterranean region – Introduced to U.S.: Late 1800s or early 1900s

Johnsongrass

– Scientific name: Sorghum halepense – Native habitat: Mediterranean region – Introduced to U.S.: Early  1800s

Russian Knapweed

– Scientific name: Rhaponticum repens – Native habitat: Eurasia – Introduced to U.S.: Early 1900s

Quackgrass

– Scientific name: Elymus repens – Native habitat: Eurasia – Introduced to U.S.: 1600s

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