<p> </p><p>The paper relates to study of biological activity of 40% ethanol extracts of <em>Dracocephalum moldavica,</em> <em>Hyssopus officinalis</em>, <em>Satureja hortensis</em>, <em>Lophanthus anisatus</em> and <em>Monarda diduma</em>, grown in Ukrainian Polissya, against a pathogenic agent <em>Escherichia coli</em> UCM – B (ATCC 25922).</p><p>The research proves that ethanol extracts of <em>H. officinalis</em>, <em>D. moldavica, S. hortensis, L. anisatus</em> exert antimicrobial activity as the extracted substances provided a twofold increase in minimum bactericidal concentration (MBC) values against <em>E. coli. </em>Likewise, a twofold increase was observed in minimum inhibitory concentration (MIC) of <em>L. anisatus</em> ethanol extracts. As to <em>M. diduma </em>ethanol extracts, their inhibitory and bactericidal influence on <em>E. coli</em> was not registered.</p><p>Oil-bearing plants (family <em>Lamiaceae), </em>grown in Zhytomyr Polissya, are characterized by antimicrobial properties, attributed to biologically active substances that are formed and accumulated in the plant material. The main components of hyssop essential oil are isopinocamphone (44.43%), pinocamphone (35.49%), myrtenol (5.26 %), germacrene D (3.15 %), pulegone (2.93 %), bicyclogermacrene (1.35 %). In mint anise essential oil prevailed pulegone (59.19%), izomenton (14.34%), bicyclogermacrene (3,21 %), <em>β</em>-kariofilen (2,99 %), menton (2.21 %), 1,6-germacradien-5-ol (1.5 %), isopulegone (1.4 %), in summer savory – carvacrol (89.07%), g-terpinene (3.53%), <em>α</em>-thujone (1.7 %), camphor (1.48 %). The dominant components of moldavian dragonhead essential oil were geranial (26.19%) and neral (22.36%), 2-(1-hydroxy-1-isopropyl)-cyklopentanon (8.29 % ), 2,3-dehydro-1,8-cineole (6.87 %), 3-(1-hydroxy-1-isopropyl) cyklopentanon (6,51 %), nerol (4.74 %), 3-methyl-2-cyclohexane 1-on (2.13 %).<em></em></p><p>The paper draws attention to further more detailed study of ethanol extracts of hyssop, moldavian dragonhead, summer savory, mint anise with the aim of producing antibacterial herbal preparations.</p>