What is ragweed? And why does it cause allergies in the late summer?

MINNEAPOLIS (WCCO) — While our summer has been dry, many can’t say the same for their nose or eyes. Ragweed allergies are picking up steam.

“Ragweed is actually a very, very common weed that grows wild throughout the Midwest and Northeast,” said Dr. John Sweet, an allergist with Hennepin Healthcare.

Its leaves have a fern-like appearance with greenish-yellow flowers at the end of its branches. Sweet said just one single ragweed plant can generate a billion grains of pollen that can travel more than 100 miles…

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