Vetiver on coastal path in Vanuatu - 100 YEARS OLD

This photo from Don Miller shows 100 year old vetiver hedgerow (planted in 1912) that was planted along a coastal path. You can see clearly how it has halted the beach erosion and kept the path in place.  Thank you Don for sharing the image.

I wonder who the person was who arranged to plant this vetiver?  Must be some history about it.  I am sure most people who use the path have no dea what the grass is and what it has achieved.