Black Seeded Needle Grass (Piptochaetium avenaceum) grows 2 ft. in height and to 3 ft. when with flower. It is a perennial grass that grows best in moist to dry, well-drained soils. Black Seeded Needle Grass needs soils that are acidic to neutral and full sun to part shade. It is great for natural landscapes, wildflower gardens, and restorations. Grasses serve many ecological services which should be considered when planning landscapes.