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In the present dissertation was studied the effects of biomolecules on the growth of the specimens of the spearmint. Spearmint (Mentha spicata L.) is a mint species that is indigenous to Europe and Southwestern Asia. Beyond its use as an anticonvulsant, tonic and digestive herb, it is used to flavor various foods. In the framework of the dissertation, were studied the results of the effects of biomolecules on the cultivation of the mint on its physiology. Three different biomolecules were selected: Gibberellin and Cytokinin at concentrations of 100 μM and 150 μM and Salicylic acid at concentrations of 1 mM and 3 mM. The plants’s behavior was studied in terms of fluorescence of chlorophyll and chlorophyll concentration. Significant changes were observed in the various fluorescence parameters of the biomolecules in relation to the control plants. Particularly, chlorophyll content (a + b) decreased in plants by treated with cytokinin (150 μM) and salicylic acid (3 mM). Also, in plants which treated by the highest concentrations of gibberellin, cytokinin and salicylic acid the fluorescence parameters fv / fm was decreased. Similar results we founf for the fluorescence parameters fv / fo.