Ambrosia trifida
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| iGiant Ragweed | ||||||||||||||
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| Ambrosia trifida |
Ambrosia trifida, variously called Great Ragweed, Giant Ragweed, Bitterweed, Bloodweed, is a perennial plant in the aster family, native throughout much of North America. Its flowers are green and are pollenated by wind rather than by insects, and the pollen is one of the main causes of late summer hay fever. Flowers are borne from midsummer through early fall.
The plant is erect, growing to 3 meters tall from clumping rootstocks.
