Pairing Vetiver with Food Plants

Tho Ngo's work in Vietnam (near Hanoi)  pairing Vetiver with fruit trees  and vegetables plantings is an exciting project.
Tho's hypothesis is that Vetiver 'wicks' moisture up to the accompanying plant's roots....even when both plants are planted in the same hole.
In Thailand, as elsewhere (like my own garden) , vegetable beds are laid out  with similar attributes in mind by bordering them with Vetiver hedges.
As you can see (click on image to enlarge), the Vetiver is also cut for mulch.
Vetiver roots -- which can go down 2 metres -- are also sponsoring of rich microbial activity and carbon sequestration. As well the stems and scented leaves offer various means of protecting companion-ed plants from bugs.