Most likely your only experience with vetiver grass has been olfactory, given its longtime use in the perfume industry (think Guerlain's V?tiver, Kenzo's Kenzoair, or Lalique's Encre Noir, to name only a few). But according to a report from the University of Guam, soil science professor Mohammad Golabi's research shows that using vetiver grass to shield reefs in Guam's Pago Bay helps protect them from the effects of construction-induced run-off.
One of the greatest hazards Guam's reefs face is sedimentation and suffocation resulting from soil erosion, the report states. In discussing his solution, Professor Golabi says, "Vetiver's ability to tolerate high stress situations, adapt to a variety of conditions, develop a dense vertical root system, and powerful soil binding characteristics make it an ideal candidate for controlling soil erosion." The strong root system is capable of binding the soil to a depth of 3 meters and creates a dense and protective underground curtain. (The roots, coincidentally, are also the raw material fragrance houses rely on.)
Once established, the plants can live up to 50 years and do not require maintenance other than periodic trimming. Under the proper conditions, thick hedges can be formed within one year of planting, although the report points out that "it generally takes two to three growing seasons to establish a hedge dense enough to withstand torrential rains and protect the shoreline from sedimentation."
Comments
You won't find anther grass with the characteristics of vetiver. Here is a link to another impressive work on reef protection; <a href="http://www.vetiver.org/VAN_REEF/VAN-reef2.htm" rel="nofollow">http://www.vetiver.org/VAN_REEF/VAN-reef2.htm</a> As engineers you should also note that vetiver is being used for slope stabilization and phtyoremediation take a look at: <a href="http://www.vetiver.org" rel="nofollow">http://www.vetiver.org</a> Dick Grimshaw
Thanks so much for your comment and additional info--much appreciated. And, yes, I'm sure you're right about nothing matching vetiver's impressive characteristics. When I wrote the question above, I figured it would be hard to match/top vetiver.