Would stump removal applied to the edges of spreading liriope keep it from spreading?

Answer 1

Monkey Grass (liriope) sends out runners underground, so digging it up works better. I'd be worried the chemical would travel thru the runners to the main plant and kill it, too.

https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/removing-monkey-grass.htm