Highest in spring: Birch trees pollinate from early march to late may depending on the geographical location. Birch pollen counts are usually low rest of the year.
Answered 1/16/2014
5.8k views
Highest in spring: Birch trees usually pollinate from early march till late may depending on the geographical area. Pollen counts are typically low rest of the year.
Answered 3/23/2013
5.8k views
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