Purple three-awn. Upright clumping grass native to dry regions of North America and Mexico, this rugged species can be used in meadows, dry gardens, grass borders or native gardens. Self-sowing may be a nuisance in some areas, but the beauty of the backlit purple flowering heads often surpasses any disappoint in the plant’s spread. Provide full sun, well-drained soils and only infrequent water. Hardy to 0F. Aristida purpurea var. purpurea is available this week in four inch and one gallon containers.