1. Using plastic bags
The plastic bags used for vetiver grass multiplication are of two sizes,
large and small. Generally, the large one is a black plastic bag with folding at one side and a size of 4 inches wide and 9 inches long or larger than that. When filled with nursery soil, the large plastic bag will have a diameter
of 15-20 cm. The small one has a size of 2-2.5 inches wide and 6-8 inches long, and has a diameter of 5-10 cm. when filled with soil. Propagation of vetiver tillers in large plastic bags can produce a large number of new shoots and
the planting material can be kept in the bag for an extended period of time. Hence, these vetiver clumps are suitable for further multiplication or for separating into tillers for large-scale transplanting. As for those in small
bags, they are suitable for direct transplanting on land or specific areas for soil and water conservation purposes, such as in hedgerows, on roadsides and road shoulders, along pond edges, and on paddy bunds to hold the soil
together in dry, impoverished and saline conditions. Planting vetiver tillers propagated in small plastic bags ensures a better survival rate and faster establishment of the grass.
2. Vetiver ecotype and tiller preparation
Preparation of vetiver tillers means using studied and selected ecotypes that are over 4 months old, and fully mature with elongated internodes.
If the tiller is not in inflorescence stage, separate it into solitary shoots. If it is in inflorescence stage with elongated internodes or the internodes just start to emerge, separate with 1-2 young shoots. It is also advised to
cut the apex off at 20 cm. and cut their roots as short as possible. Then peel the old outer sheath off and clean it with water. Next, gather it into small bundles and dip under water or in a mixture of root-accelerating hormones,
which are available in the market. The bundles are dipped for only one day, then placed together in a pile with the base covered with vetiver leaves or newspaper. Afterward, water the bundles, cover them with plastic sheets, and
leave in shade for 3-5 days. When new shoots and roots of vetiver come out, select some for transplanting in soil and put others in plastic bags for further propagation.