One of my favorite perennials is Variegated Liriope. The bright green and white foliage looks great from late spring into fall. I find that it really brightens up my shady front yard and provides a nice backdrop for annuals.
Purple flowers bloom from mid-summer to early fall. Seed heads then form to provide late fall/winter interest.
Liriope does not need much maintenance - except in the spring. In spring, it needs a good haircut.
Take a look at this photo. New green leaves leaves are pushing up from the base of the plant.
But last years old green/brown foliage is still there. This foliage will not look nice and healthy again. It's best to cut back the old brown foliage before the new growth gets too tall.
Simply use a pair of sharp pruners and cut the old brown foliage back all the way to the base.
Most grasses benefit from this spring haircut but many grasses turn completely brown in the winter. Liriope is deceiving because the leaves stay somewhat great but turn brown around the edges. You can feel like you are cutting back healthy growth. But trust me, this hair cut will do your plants good and you will be rewarded for your work by new lush growth that will look great all summer long.