Flowers and trees bloom longer and produce more pollen in Florida because frigid winters and drought-affected summers are virtually non-existent. Allergies are more severe and last for a longer time. Different allergen-producing foliage peaks at different times of the year and at different periods of the year.
Common Florida Allergens
The season for oak and pine trees is from December to May, and then again from October to November. The pollen season for grasses lasts from April through October. Ragweed and dog fennel have a weed pollen season from May to December, with sorrel and dock having a secondary pollen season from March to July.
Ragweed is common across Florida and is a common source of allergies, particularly in the fall. Ragweed allergens may travel hundreds of kilometers in the wind. In a single season, a single plant may produce over one billion grains of pollen.