If your allergies are acting up, it may be due to a lack of sex.
Sex between trees, that is.
WTOP Garden Editor Mike McGrath says while it sounds funny, it's no joke. It's science.
Female trees, such as crabapple trees and ginkgoes, are disliked in many cities because of the mess they leave in late summer.
"The female ginkgoes drop their fruit, which smells bad, and the ornamental crabapples drop these little rotten apples," says McGrath, who explains that many of the female trees are killed due to their unpleasant odor.