The American elm is widespread throughout the eastern and mid-western United States and extends from the western portion of Newfoundland to eastern Saskatchewan in Canada. It is moderately allergenic and can cause allergic reactions in some individuals. Other elm species are not as allergenic but are still considered important allergens and are widespread across the United States and parts of eastern Canada. The American elm can bloom from February to April depending on the location. Other species of elm that are found in the southern U.S. blossom from August to October.
Last Updated: 14 October 2009
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