Periodic applications of nitrogen during active spring growth will enhance color and size. Low rates of application are preferred. The only other maintenance task is the annual cutting back. This stimulates the development of new grass blades and freshens the look of the plant. Most species are sheared just prior to new shoot development, normally by late winter or early spring.
Few pests affect the grasses, aphids being the most bothersome.
Most plants will simply outgrow the problem. Moderate pressure sprays of water will hasten the departure. Rabbits and gophers may become pests during poor forage years. These pests may require exclusion or trapping. I have found that most look best when used in masses or individually tucked in next to a large boulder.