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When do cottonwood trees bloom in Dayton, Ohio & when does the fluff start floating through the air? #150388

Asked August 31, 2013, 5:45 PM EDT

When do cottonwood trees bloom in Dayton, Ohio & when does the fluff start floating through the air? About when does the cottonwood fluff stop floating through the air?

Montgomery County Ohio

Expert Response

Depends upon the year and air temperature. The pollen starts in late March and April. The seeds are transported in the cottony fluff in May and June. Unless there are some odd balls stuck in the tree, the fluff should be done in June.

Greg Meyer 
An Ask Extension Expert Replied September 03, 2013, 3:09 PM EDT

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