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Amorpha fruticosa L. is mainly known as an ornamental plant, but also as the source of the medicinal substance amorphine. Indigo bush is an invasive shrub in the Fabaceae family, native to eastern part of North America. The fruits of this species contain the rotenoid compound amorphine which was used for its cardio-sedative properties in nervous complaints, vegetative neurosis and paroxysmal tachycardia. The present study aims to assess the antimicrobial activity of the essential oil from Amorpha fruticosa fruits in correlation with its chemical composition. The volatile oil was extracted by hydrodistillation (1.3-1.8% dry basis) from the fruits of indigo bush, harvested from three locations near Iasi. Gas-chromatography coupled with mass spectrometry was applied in order to analyse the composition of volatile oil, revealing the following main compounds: γ-muurolene, α-zingiberene, δcadinene and α-eudesmol. The antimicrobial activity was tested against four Gram-positive bacteria