This grass has toxic effects on US livestock, and it's spreading
grist.org
As warming temperatures enable tall fescue to move northward, scientists and ranchers are racing to stop its expansion.

It’s a longstanding problem, and it’s spreading. Warming temperatures from climate change are now expanding the northern limit of the fescue belt, and the grass is marching into new areas, taking root on disturbed land, such as pastures. Northern Illinois and southern Iowa could already be officially added to the fescue belt, Roberts said, introducing toxicosis to new farming regions.