If you don't want to install a barrier, you can also dig around the edges of the Liriope and pull out any root sections that are threatening to overtake the rest of your garden. Use a sharp spade ...

Some of the best landscape plants are groundcovers, as they are easy to establish and maintain and provide season-long interest.

so they have time to establish their roots. Trim liriope in late winter or early spring. Mow or cut back foliage to the ground before new shoots emerge. If you do it after the shoots are up ...