Taweesak,
The veti-plugs look awesome for natural erosion control. Do you start the planting trays from seeds or cuttings? How easy is it to raise from onset in trays to the size in your picture?
I am a geologist, not a plant guy. The habit of the grass looks much like the growth habit of nutsedge we have in Kansas. The nutsedge is quite invasive and hard to kill, but I think it is an entirely different family of plant.
Thanks for the help.