Vetiver grass is native to south Asia and is commonly used in sub-Saharan Africa. As it is effectively sterile it cannot become an invasive plant. It grows in place relatively quickly and has very long roots which support soil stabilization. Vetiver is a non-food crop that is commonly used in Africa and Asia to prevent soil erosion and promote essential oil production. It is used in wastewater treatment and has been shown to remove nitrates, phosphates and heavy metals contaminants. Vetiver is also a C4 grass that is extremely efficient in converting the nutrients from sludge and sunlight into usable energy.