Late springtime pollens come from the grasses, timothy, orchard, red top, sweet vernal, bermuda, johnson, and some bluegrasses.
Early springtime hay fever is most often caused by pollens of trees such as beech, ash, oak, walnut, sycamore, cypress, hickory, pecan, cottonwood, elm, maple, birch, poplar, and alder.
Colorful or fragrant flowering plants rarely cause allergy because their pollens are too heavy to be airborne.
The most significant in the United States is from ragweed.
It begins pollinating in late August and continues until the first frost.
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Pollen Allergens
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