Lilyturf (Liriope spp.) is a good drought-tolerant edging plant and ground cover. It has dark green foliage and contrasting purple flowers. A variegated variety called Aztec grass is available. Liriope forms dense clumps, which typically reach 7 to 12 inches high, with the "Evergreen giant" variety even taller. When you plant lilyturf, be sure that the crown is slightly above the soil and then be careful that you keep mulch at least 2 to 3 inches away from the base of the plant. Crown rot can be a problem if it is planted too deeply or the mulch creeps in around the plant and keeps the crown too moist.
Information from Carol Suggs and Theresa Badurek of the Pinellas County Extension Service and from the Hillsborough County Extension Gardening Almanac. For answers to common landscape questions, go to www.askextension.org; pinellascountyextension.org; or hillsborough.extension.ufl.edu.