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Brightly colored, perfumed flowers such as roses are less likely to cause allergic reactions, because their pollen is too large, heavy and sticky to travel in the air.

Pollens can remain on your skin and hair for many hours after you have spent time outdoors.

Pollens are small, round-shaped male cells of flowering trees, grasses and weeds.

The average pollen particle is less than the width of a human hair.

The amount of pollen that trees release in the spring is determined the previous fall.

The plant most responsible for triggering allergic reactions in the fall is ragweed.

Pollens can travel as far as 400 miles and up to two miles high in the air.

Plants have pollination cycles which are consistent from year to year, though weather conditions can affect the amount of pollen in the air at any time.

Trees pollinate earliest, followed by grasses. Weeds pollinate last. Pollens vanish after the first hard frost for most regions.

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Date of Last Update: 07/27/12