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Abstract: The allelopathic effects of leaf volatiles of Lantana camara on the germination and seedling growth of two coexisting species (invasive Bidens pilosa and native B. bipinnata) and two crops (Raphanus sativus and Lactuca sativa var. ramose) were studied by laboratory bioassay. The experimental results showed that germination energy, germination rate, bud length and root length of the four receiver plants were significantly reduced by the different concentrations of leaf volatiles of L. camara, and the allelopathic inhibitory effects generally enhanced with the increasing treatment concentrations. But the same concentration of leaf volatiles of L. camara had different allelopathic inhibitory effects on the four receiver plants, allelopathic inhibitory effect on native B. bipinnata and two crops was stronger than that on the invasive B. pilosa.