If you want a neat, durable grass that holds a clean line along paths, beds, or lawn borders, Festuca arundinacea 'Perfect Edging' is an easy choice. This tall fescue forms a dense, bunching clump of green blades with an upright, orderly look, making it useful where you need a crisp edge without constant fuss.
In the landscape, you can use it to define borders, fill narrow strips, or blend into turf areas. Mature size is about 14-18 inches tall with a spread around 18-24 inches, so it stays compact enough for edging while still providing a substantial, grassy texture.
Give it full sun to part shade and keep moisture at a moderate level, especially while it is establishing. Once rooted in, it handles dry periods better than many cool-season grasses, but it will look best with occasional deep watering during extended drought. It adapts to many soils as long as drainage is reasonable.
For best appearance, keep it trimmed or mowed to maintain the tidy outline, and rake out or thin clumps if they become uneven. If you are using it in a turf-like setting, overseed thin areas as needed to keep the stand full and even.