No Stolons or Rhizomes: Unlike many other grasses that spread horizontally via stolons or rhizomes, vetiver grows in dense clumps or tufts. Its root system grows vertically and does not invade adjacent areas.
Sterile Cultivars: Most commercially used vetiver genotypes, such as the 'Sunshine' variety widely used in Hawaii, are sterile and do not produce viable seeds. This prevents the plant from spreading beyond where it is intentionally planted.
Asexual Propagation: Vetiver is typically propagated vegetatively through root or tiller division. Since it does not spread by seed, its expansion is limited and easily controlled.
Long History of Use: Vetiver has been used for centuries in various parts of the world, and there are no reports of it becoming a significant invasive weed in regions where sterile cultivars are used.