Ambrosia trifida

Giant Ragweed

Names and Myths

Ambrosia Classical name of the food of the God’s

trifida Three lobed leaves, some have 5.

Ragweed the look of the leaves

Natural history / Folklore

Wind pollinated and producing great amounts of pollen in the fall. Like its shorter sister it is a major source of pollen, hence hayfever. It can grow to 15 feet in height.39


July to September, Terminal cluster of pollen producing flowers, palmate leaves with 3 to 5 lobes. Lower leaves are opposite and upper leaves are alternate.

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