What does cheatgrass mean?
Cheatgrass (Bromus tectorum) is an annual grass native to Eurasia that has become one of the most destructive invasive plants in western North America. Also known as downy brome, it germinates in autumn, matures early in summer, and then dries into highly flammable tinder. Because it colonizes disturbed ground quickly and produces abundant seed, it can displace native bunchgrasses and sagebrush over vast rangelands. Its presence shortens fire intervals dramatically: where fires once occurred every few decades, cheatgrass-dominated landscapes may burn every few years, preventing natives from re-establishing. The popular name reflects farmers' sense of being cheated by a weed that invaded grain fields and died off early, though the precise origin of the term is debated. For ranchers, conservationists, and wildfire managers alike, "cheatgrass" is shorthand for ecological degradation and heightened fire risk.
nounAn invasive annual grass (Bromus tectorum), also called downy brome, native to Eurasia but now widespread in North America, where it crowds out native vegetation and greatly increases wildfire risk.
- The annual grass Bromus tectorum, an aggressive Eurasian invader of western North American rangelands that dries out early in summer and fuels frequent wildfires.
"The hillside, once carpeted with native bunchgrasses, had been taken over almost entirely by cheatgrass."
"Ranchers have spent decades battling the spread of cheatgrass across their rangelands."
"After a wet spring, the hillsides were blanketed in dense stands of cheatgrass that turned to tinder by July."
Rarely pluralized; the singular mass-noun form covers both individual plants and stands. A plural occasionally appears when distinguishing different types or patches.
"Several distinct cheatgrasses were identified in the survey plots."
Cheatgrass is so flammable that it has rewired the American West's fire cycle, burning more often and pushing out the sagebrush ecosystem.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cheatgrass
The compound combines "cheat," an English verb and noun of deception, with "grass." "Cheat" itself derives by aphesis from Middle English "escheat," ultimately from Old French "eschete." The name arose among North American farmers, who felt cheated by this European weed that invaded their fields and matured before crops were ready. The scientific name Bromus tectorum places it in the brome genus Bromus, from Greek "bromos" (oats).
How cheatgrass is actually used
The term is used chiefly in North American contexts — by ranchers, land managers, ecologists, and wildfire scientists. It carries strongly negative connotations, since the plant is regarded purely as a noxious weed. In British usage the species is more often called "downy brome."
Easily confused with cheatgrass
"Brome" refers broadly to grasses of the genus Bromus, while "cheatgrass" names one particular weedy, invasive species within that genus.
"Cheat" as an ordinary noun means a fraud or act of deception, whereas "cheatgrass" is the name of a plant — the two share only the first element of the compound.