The ash are very widespread trees found all over Canada and the United States except the Rockies. The flowering period in the South is February and March and May in the North. They are entirely wind-pollinated and are moderately allergenic. The ash and the privets (Ligustrum) are part of the olive family. Ligustrum is insect pollinated while some of the pollen can become airborne it is not considered to be an important allergen. Olives of the Mediterranean area are related to the ashes and were introduced in the southwestern states and southern Florida. They are partly wind-pollinated, high numbers of pollen can get airborne and can cause allergic reactions.
Last Updated: 14 October 2009
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