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The aim of the present study is to study the potential of biochar to be use as a fertilizer / soil amendment for plant cultivation. Biochar is defined as the solid, carbon-rich residual (product) during thermal treatment of solid wastes produced from tanneries in a pyrolytic furnace in an oxygen deficient environment, that are characterized by low carbon content. Two biochar samples were used in this study: one was produced during long residence time, 14 hours (white sample) while the second one produced at short reaction time (2 hours, black sample). The study of the agronomic characteristics carried out by monitoring the growth of rocket seeds in three different biochar mixture substrates: standard soil saqmple, peat-perlite and commercial compost substrate – sand. Three different substrate mixtures were prepared aiming to determine the optimum mixture combination for plant growth. After plant seeding, measurements were carried out including the number of species that were planted and the average height. Transplantation of the plants followed in the peat-perlite and white biochar substrate. Measurements performed showed a faster growth of the plants in the 1:10 biochar mixture