Bottle Gentian (Gentiana andrewsii) is a seasonal plant with blue blooms in fall. They prefer moist soil in sun to part sun, where they grow up to 2 feet tall. They are a good choice for slopes and basins. Companion plants include Southern Blue Flag Iris (Iris virginica var. shrevei) and Palm Sedge (Carex muskigemensis).
No serious maintenance needs.