Setaria viridis, commonly known as green foxtail, is a species of grass native to Europe and Asia but has spread to many parts of the world. It typically grows in disturbed areas, such as roadsides and fields, and can reach heights of 30 to 100 centimeters. The plant is characterized by its slender stems and distinctive, bushy flower spikes that resemble a fox's tail. This grass is often considered a weed in agricultural settings due to its ability to compete with crops for resources. Setaria viridis can reproduce quickly, producing numerous seeds that can remain viable in the soil for several years, making it a persistent challenge for farmers.