Common names:
Buffalo Weed, Great Ragweed, Giant Ragweed, Bitterweed, Bloodweed, Horse Cane, Tall Ambrosia
Ambrosia trifida is an
annual plantAn annual plant is a plant that usually germinates, flowers, and dies in a year or season. True annuals will only live longer than a year if they are prevented from setting seed...
in the aster family, native throughout much of North America. Its flowers are green and are pollinated by wind rather than by insects, and the pollen is one of the main causes of late summer
hay feverHay Fever is a comic play written by Noël Coward in 1924 and first produced in 1925 with Marie Tempest as the first Judith Bliss.Laura Hope Crewes played the role in New York...
. Flowers are borne from midsummer through early fall.
The plant is erect, growing to 3 meters tall from clumping rootstocks.
Giant Ragweed is one of the most competitive weeds found in
North AmericaNorth America is the northern continent of the Americas, situated in the Earth's northern hemisphere and in the western hemisphere. It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the west by the North Pacific...
.
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Common names:
Buffalo Weed, Great Ragweed, Giant Ragweed, Bitterweed, Bloodweed, Horse Cane, Tall Ambrosia
Ambrosia trifida is an
annual plantAn annual plant is a plant that usually germinates, flowers, and dies in a year or season. True annuals will only live longer than a year if they are prevented from setting seed...
in the aster family, native throughout much of North America. Its flowers are green and are pollinated by wind rather than by insects, and the pollen is one of the main causes of late summer
hay feverHay Fever is a comic play written by Noël Coward in 1924 and first produced in 1925 with Marie Tempest as the first Judith Bliss.Laura Hope Crewes played the role in New York...
. Flowers are borne from midsummer through early fall.
The plant is erect, growing to 3 meters tall from clumping rootstocks.
As a weed
Giant Ragweed is one of the most competitive weeds found in
North AmericaNorth America is the northern continent of the Americas, situated in the Earth's northern hemisphere and in the western hemisphere. It is bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the southeast by the Caribbean Sea, and on the west by the North Pacific...
. At average distributions it can reduce
cornMaize , is a herbaceous plant domesticated in Mesoamerica and subsequently spread throughout the American continents...
crop yields by 55% and
soybeanThe soybean or soya bean is a species of legume native to East Asia. The plant is classed as an oilseed rather than a pulse. It is an annual plant that has been used in China for 5,000 years to primarily add nitrogen into the soil as part of crop rotation...
yields by 52%. It is very difficult to control Giant Ragweed through mechanical means or herbicides, but it does not tolerate mowing, so planting small grains in succession is an effective way to suppress infestations.
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