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Giant Ragweed : Kentucky IPM

Giant Ragweed (Ambrosia trifida)

You may find giant ragweed in both corn and soybean fields as well as along roadsides and in pastures.

Giant ragweed is a warm-season annual broadleaf weed with thick spoon-shaped cotyledons which are approximately the size of a fingernail. The leaves are arranged oppositely on the plant and usually develop lobes and pubescence as they grow. Plants may grow to a height of 15 feet or more.

Giant ragweed is also know as horseweed. The pollen of ragweeds is an irritant to those who suffer from hay fever.

Giant ragweed seedling

This site was created and is maintained by Pat Dillon, Department of Entomology, University of Kentucky, S-225 Agricultural Science Ctr North, Lexington, KY USA  40546-0091 (phone: 859/257-3571). Please send questions or suggestions to: pdillon@uky.edu