Nonnative plants are more widely distributed in the United States than native plants.
January 2015. American Association for the Advancement of Science. Invasive plants are conquering the United States. The first comprehensive assessment for the continental United States has found that nonnative plants are more widely distributed than native plants are. And humans are largely to blame.
Invasive plants have been a problem in the United States for years. They range from the fast-growing Japanese kudzu, which has smothered more than 3 million hectares, mostly in the South, to the bristly cheatgrass, native to Eurasia and the Mediterranean, which has wreaked havoc on western lands, crowding out other grasses and fueling bigger fires in places like Nevada. Yet scientists have long assumed that native species are more widely distributed than these newcomers, because the natives have had more time to fill in their potential ranges.