(Arkansas, Louisiana, Mississippi, Alabama, Georgia, Florida, Tennessee, Kentucky, West Virginia, Virginia, North Carolina, South Carolina)

In this region, a variety of trees can cause allergies in some people for short periods of time. Some of the most common allergy-causing trees are the pecan, oak and cedar. Other trees that can cause allergies include the maple/box elder, birch and hickory.

Grass pollens can pollinate nearly year-round in parts of this region. Some of the most problematic grasses are Bermuda, bahia, redtop, vernal, orchard, rye, salt grass, fescue and timothy.

Among the allergy-causing weeds are ragweed, plantain and nettle. Other weeds to watch out for are lamb's-quarter, sagebrush, English plantain, pigweed, waterhemp and carelessweed.