Spring to Fall
All species are wind-pollinated and usually produce large amounts of pollen. These plants are likely cause of allergy.
The most important allergenic plants are the grasses which are members of the largest family of wind-pollinated plants (POACEAE). The most pollination occurs during the summer months, but there are few exceptions. Below is a simplified table showing different pollination times for the important allergenic grasses by region. <div style="margin:10px;"><img src="http://www.pollenlibrary.com/library_images/grass-allergy-season.png" alt="grass allergy season" /></div>
The shaded areas on the map indicates where the genus has been observed in the United States.
Enter a full or partial species name to find more information on one of over 1,200 potentially allergenic plants.
For example, you can find chenopods searching on "cheno"