Plants that give off the most pollen include: Trees such as oak, ash, elm, birch, maple, alder, and hazel, as well as hickory, pecan, and box and mountain cedar. Evergreen juniper, cedar ...

and different sexes of trees produce different types of pollen. Alongside being classified as their type, like birch, oak, maple, and pine, trees also have sexes. LOCAL: Farmers celebrate new law ...