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This paper reports an evaluation of Annaba city climate impact on phytochemical composition and antiradical power of Tropaeolum majus leaf, flower and fruit extracts. Significant phenolic, flavonoid, tannin and carotenoid levels were registered in leaf extract, whereas flower extract showed higher yield, vitamin C and anthocyanin contents. The 2-Diphenyl-1-picrylhydrazyl scavenging power was significantly higher in leaf extract. Conversely, hydroxyl antiradical power was significantly higher in fruit fixed oil. These results show that the Mediterranean climate of Annaba City improved Tropaeolum majus leaves and the nutritional qualities of flowers and fruits, enhancing their phytochemical composition as well as antiradical properties. [ABSTRACT FROM AUTHOR]