The most common hay-fever triggers are plant pollens. Flower pollen is usually carried by bees, so it isn’t windblown and rarely gets into people’s noses. The most prolific culprits are weeds such as ragweed, sagebrush, and thistle. More than 1,000 kinds of grass grow in North America, but only a few—including the Kentucky bluegrass that’s probably in your yard—produce allergic pollen. Trees with the highest pollen counts are oak, ash, elm, hickory, pecan, box elder, and mountain cedar. Regardless of what your child may be allergic to, symptoms are generally the same so many holistic pediatricians don’t recommend allergy skin tests. “Most pollen can’t really be avoided anyway,” says Neustaedter.