Birch is common throughout most of North America. The season can very from March to May, depending on the location. In the southeastern states the pollination season is from March to mid-April. In the eastern part of Canada the season is as late as May. They are all wind-pollinated and copious amounts of pollen are released into the air and they are significant in causing allergic reactions. There is cross-allergenicity among the birch species. If an individual has allergies to one species than they will likely have a reaction to the other birch trees.
Last Updated: 14 October 2009
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