Fall Pollinating Trees
Although most trees pollinate in the spring, there are some exceptions. Some of the fall pollinating trees are important allergens and include the following:
- Ulmus spp - Most elm trees pollinate in February and March in Oklahoma; a few elms flower and produce pollen in the Fall, usually in September and early October. The fall pollinating elms include Ulmus crassifolia (cedar elm) ane Ulmus parvifolia (Chinese elm).
- Juniperus pinchotii - Redberry juniper grows in southwest Oklahoma and west Texas. This species pollinates from late through November. The pollen is carried to Tulsa on days with strong southwest winds. The pollen from redberry juniper is highly allergenic. This species is related to mountain cedar or Ashe juniper (Juniperus ashei) which often begins pollinating in December right after redberry juniper.