In the 1800s, an Old World grass likely arrived in settlers’ grain and other cargo, and today cheatgrass fuels larger, more frequent wildfires across the American West

Mixed unnoticed among sacks of grain carried by European settlers during the late 1800s, the dry, wiry seeds crossed the Atlantic and took root across North America. Few could have predicted that this grass would spread across millions of acres, outcompete native plants, and alter how the American West burns.

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