Sourgrass' is native to a broad swath of the tropical and subtropical Americas. In these regions, 'sourgrass' grows in its natural range, which spans across the two major landmasses. Additionally, 'sourgrass' has been introduced to parts of Oceania and East Asia. While it has adapted to some areas outside its native habitat, in certain regions of Oceania and Southeast Asia, 'sourgrass' is sometimes thought to be an invasive species that may have an impact on local ecosystems.