S. South America
"It has escaped from cultivation and it is invading abandoned farmlands, roadsides, shrublands and wetlands. C. selloana threatens native vegetation and poses a fire hazard because of the accumulation of dry leaves and flowering stalks on the plant." 
"This species has been planted for many purposes (for example, as a windbreak or to prevent erosion), but because of the attractiveness of its panicles it has mainly been used as an ornamental." 
"With the rapid development of industrial society, environmental safety faces the increasing threat. Water pollution becomes one of the most serious problems in environmental fields. The textile industry is a water-consuming and heavily polluting industry. It is estimated that over 500 tons of various dyes are discharged into the water body and approximately 80% of wastewater comes from the textile industry. The remarkable characterization of the dyeing wastewater is potentially toxic and poorly biodegradable, which results in a tremendous threat to aquatic organisms.
The removal of color from dyeing wastewater has been extensively investigated. Various technologies, such as chemical coagulation, oxidation, ozonation and adsorption, have also been used to removal the dye from wastewater in the past few decades. Among these techniques, the adsorption as a kind of efficient and non destructive technology due to the simple, highly efficient separation process and easy operation method has attract extensive attention. However, the key of adsorption technology lies in the development of adsorption materials with high adsorption performance and low cost for the practical application. Many adsorption materials have been developed and activated carbon is a preferred adsorbent for removing dye from water. However, activated carbon is restricted due to high cost. Therefore, other attempts that explore cheap, locally available and effective materials need to be made...
...Cortaderia selloana flower spikes and cortaderia selloana flower spikes-derived carbon fibers are employed as novel and low-cost adsorption material to remove the MB for simulated wastewater. The used cortaderia selloana flower spikes as biomass can be directly collected from outdoors, and carbon fiber materials are easily prepared by air-limited calcination with cortaderia selloana flower spikes as the precursor. Flower spikes and carbon fibers have potential applications for removing MB from contaminated water." 
 Domènech, R., Vilà, M., Pino, J., & Gesti, J. (2005). Historical land‐use legacy and Cortaderia selloana invasion in the Mediterranean region. Global Change Biology, 11(7), 1054-1064.