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Aims:The effect of aqueous extracts of castor bean (Ricinus communis L.) On the germination of six cultivated crops was investigated. Study Design: Samples of R. communis were harvested from the region of Gabès (south of Tunisia) and tested at laboratory on crops seeds. Place and Duration of Study: Regional station of Gabès-National Institute of Research in Rural Engineering, Waters and Forests -Tunisia, between October and December 2014. Methodology: Extracts were obtained after an incubation of 9 g of dry plant material (powder) in 100 ml distilled water during 48 hours at 60°C. The extraction was made from five parts of R. communis (root, twig, leaf, seed and pericarp) and used in germination tests. Results and Conclusion:Results showed two types of behavior: the aqueous extracts of root,