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