Dynamics of germination rate of Vetiveria zizanioides seed in western Guangdong Province were studied by the experiments of germination on paper seven years after the introduction. On this basis, the different concentrations of polyethylene glycol (PEG), calcium chloride (CaCl2), gibberellin (GA3) solution and water processing were used to determine the optimal conditions for improving the germination rate of V. zizanioides seed. The results showed that: 1) The germination rate of V. zizanioides seed was increased from July to October, and the germination rate reached the maximum 3. 00% in October. However, they showed downward trend from November to December. So the optimal time for harvest of V. zizanioides seed was in October. 2) The germination rates were 14. 00% and 11. 33% in the 0. 1 g/L GA3 treatment group and the water treatment group-after 6 hours, respectively, whose germination rates were about 4 - 5 times than those in the natural conditions. Those conditions were fit for germination of V. zizanioides seed, but the overall germination rate was still low. The seedlings grew sturdily after being treated by PEG solution and water, while the transplanting survival rates were 74% and 73%, respectively.%为提高香根草种子发芽率,采用培养皿纸上发芽法,研究引种7年后的粤西香根草种子发芽动态,在此基础上,用不同浓度的聚乙二醇(PEG)、氯化钙(CaCl2)、赤霉素(GA3)溶液和水进行浸种处理,选择最佳的处理条件.结果表明:1)发芽动态,7-10月的香根草种子的发芽率不断增大,10月份发芽率为3.00％,11月、12月香根草种子的发芽率则降至0.17％,10月份为收获粤西香根草种子最适时间.2)赤霉素0.1g/L浓度处理和水6h处理发芽率分别为14.00％和11.33％,约是自然状况下发芽率的4～5倍,较有利于粤西香根草种子萌发,但总体发芽率仍较低;聚乙二醇溶液和水处理后的幼苗比较粗壮,移栽成活率分别为74％和73％.
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