Fountain grass (Pennisetum) is typically a perennial grass. Perennial means that it comes back year after year, provided it's grown in a suitable climate and given proper care. Fountain grasses can live for several years and continue to grow and produce their characteristic plumes season after season. However, it's essential to note that there are some ornamental grasses, like Pennisetum setaceum (Crimson Fountain Grass), that are grown as perennials in warmer climates but may act as annuals in colder regions where they cannot survive harsh winters. In colder areas, they may not overwinter and need to be replanted in the spring. MORE: Is Purple Fountain Grass a Perennial or Annual