hi, i have been reading about this Vetiver grass it is good for erosion, good for swales and water collection and water purification,the roots has the tensile strength of steel, roots 4 meter deep grows 2-4 meters high with in 4-6 weeks cut like grass re grows, so grow in the heat, cut and use as a mulch, then second cut cover grass for the winter with itself, because cannot freeze this is the only thing that kills it. sound to me like the perfect plant for ponds slopes and terrises and for green manure. as I have no land and live in a flat, does not mean that one day, i will have the place I dream of, so I am learning all i can, so when i get my place, i will know what to do. i hope this may of been some use, if you try some let me know how it went.
http://www.vetiver.org