Blame it on trees, grasses, and weeds. They give off small, lightweight pollen that can travel in the air for miles. The biggest offenders:
- Trees like oak, ash, elm, birch, maple, alder, and hazel, as well as hickory, pecan, and box and mountain cedar. Evergreen juniper, cedar, cypress, and sequoia trees are also likely to cause allergy symptoms.
- Grasses like Timothy, Kentucky blue grass, Johnson, Bermuda, redtop, orchard grass, sweet vernal, perennial rye, salt grass, velvet, and fescue
- Weeds like ragweed, sagebrush, redroot pigweed, lamb's quarters, goosefoot, tumbleweed (Russian thistle), and English plantain