Abstract: To reveal what is the effect of root-promoted methods on the survival rate and growth of Vetiveria zizanioides L., five root-promoted methods, namely: immersing, mudding, water-cultured, sand-cultured and rice shell-cultured, were taken to treat Vetiveria zizanioides before planted. Two conditions of water without cl element and 25 mg/L IAA were given respectively. The seedlings of the preplanted Vetiveria zizanioides were treated, and the comparative experiments with those untreated were conducted. It is showed that: each method can improve the survival rate and everyday growth height of the seedlings effectively, especially with IAA; IAA can improve the arising and growth of the new roots, and the effect of the method of mudding roots with IAA is finer; Observing the growth condition of the planted seedlings, the effect of IAA is even more evident, and mudding roots with IAA is the most effective. To sum up, it is necessary to promote roots of the seedlings before planting them, and the method of mudding roots with IAA is the most effective and convenient.

Key words: Vetiveria zizanioides, root-promoted, survival rate, growth speed