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} Some persimmons (Fuyu, Hachiya) bear only pistillate flowers, but will set fruit (parthenocarpicly) anyway without pollination and bear full crops.
Often, neighbors may have fruit tree varieties that will serve as pollinators. With appropriate bee activity and, if distances are not great, wild trees can also provide a source of pollen. The fall pollinating elms include Ulmus crassifolia(cedar elm)ane Ulmus parvifolia(Chinese elm). Juniperus pinchotii- Redberry junipergrows in southwest Oklahoma and west Texas. This species pollinates from late through November.
University of California.
The pollen is carriedto Tulsa on. Dec 20, Fall: None; Winter: Ash, willow and mulberry; Less-common tree pollens. Other trees that may be less common allergy triggers, but may still be a cause for concern are: Birch: Spring to summer; Cottonwood: Winter to spring; Eucalyptus: Spring; Elm: Spring, fall and winter (depending on the species and location) Alder: Winter to springEstimated Reading Time: 7 mins. Sep 21, Deciduous trees (those that loose their leaves in the fall) are the primary producers of pollen in the United States.
What is tree pollen?
While the makeup of each type of pollen is unique, the pollen from these hardwood trees can cause an allergic reaction in many people. Oaks are a common culprit, and so are elms, maple trees, birch trees, ash, hazel and alder trees.