Weeds are the largest source of allergy-triggering pollens in North America. In late summer and early fall in North America, ragweed pollen is the number one cause of hay fever. A single ragweed plant can produce millions of grains of allergy-producing pollen.

Common Allergy-Producing Weeds

  • cockleweed
  • goosefoot
  • hemps
  • mash elder
  • nettle
  • pigweeds
  • plantain
  • ragweed
  • Russian thistle (tumbleweed)
  • sages (mugworts)
  • sagebrush
  • sheep sorrel
  • smotherweed