Mexican Feathergrass (Nassella tenuissima (Trin.) Barkworth) is sold throughout Texas as an ornamental landscape plant. However, this grass is very opportunistic and has been known to escape and become an aggressive weed on disturbed sites. Mexican feathergrass is popular because it is an attractive, fine-leaved, warm-season plant that is hardy and drought-tolerant (Figure 1). It is also commonly referred to as fine-stem needlegrass, Mexican wiregrass, ponytail grass, angel hair grass, angel’s hair, and Texas tussock. However, Mexican feathergrass is its most popular trade name.