South America Click to see full answer. In this regard, where do you find pampas grass?Pampas Grass is listed as a Class C noxious weed, which is also known as Cortaderia selloana. It is a plant native to the area of the pampas of South America. There are many different species of this grass, all of which have become invasive throughout North America.Similarly, what is pampas grass a sign of? Pampas grass sales have plummeted due to their particular sexual connotations. Once a common plant outside suburban houses, pampas grass became known as a sign that the residents were swingers. The plant, native to South America, serves as a signal to passers-by. Keeping this in view, where does pampas grass originate from? Pampas grass is native to south America and is named for the Pampas region, fertile lowlands covering Brazil, Uruguay and Argentina, where they originally grew.What is pampas grass used for?Pampas Grass is used in many ways. A common use is as a hedge because of the razor sharp leaves and stiff stems. It is used mainly as a decoration. Pampas Grass makes a nice ornamental plant because of its large plume-like flowers.