Giant Ragweed

Ambrosia trifida

Photo of Giant Ragweed
Photo by Dr. John Meade, weed scientist emeritus
Rutgers Cooperative Extension

Like common ragweed, it releases large amounts of pollen, but it is found mostly in wet areas, while common ragweed is a dry land weed. Note that goldenrod is often blamed for "hayfever" but its pollen doesn't leave the plant. It just happens to have a very showy flower at the time that ragweed is pollinating.

Additional Images


  1. Rutgers
  2. Executive Dean of Agriculture and Natural Resources
  3. School of Environmental and Biological Sciences