Vetiver is easily killed by slicing off the crown with a shovel or other implement. It is also easily eradicated by systemic herbicides. It is so easy to remove that in some places it is used in crop rotations as a fallow crop.
We don't know why.
Over the past 50 years, the main approach to worldwide erosion control has been oriented toward engineered systems, such as terraces, bunds, or contour drains. The use of vegetative systems is generally not attractive to conservation specialists trained in engineering techniques.
Another major approach worldwide is the use of cultural systems such as crop rotations, contour planting, ridge planting, and mulches. Erosion-control hedge technology has been lying dormant.