Yes, Liriope (also known as Lilyturf or Monkey Grass) is considered toxic to cats.
Liriope contains saponins that can cause gastrointestinal upset, including vomiting and diarrhea, if swallowed by cats. Furthermore, the fibrous texture of the liriope plant can cause blockages in the digestive tract. To avoid potential harm, keep felines away from Monkey Grass. If your cat ingested this plant, or if you notice any unusual symptoms, it’s advisable to consult your vet as soon as possible.