Aristida spiciformis, commonly known as Bottlebrush Threeawn or Bristleawn Spear Grass, is a perennial grass native to southeastern United States and the West Indies. It is particularly adapted to open areas with sandy or rocky soils. This species exhibits a moderate growth rate, reaching heights of 1.5-3 feet (0.46-0.9 meters). Its distinctive inflorescence resembles a bottlebrush, hence the common name, and it typically flourishes in the warm seasons.

Bottlebrush Threeawn is valued for its unique texture and form in garden settings, particularly in xeriscaping and naturalized areas where water conservation is a priority. It is drought-tolerant, requiring minimal water once established, and thrives in full sun. The plant’s ability to grow in poor soils makes it a versatile choice for challenging sites. However, it is not commonly used in small gardens due to its less showy nature. In cultivation, it is important to avoid overwatering and to provide well-draining soil to mimic its native habitat conditions. While generally low-maintenance, it can be susceptible to rust diseases under certain conditions.CC BY-SA 4.0