The antimicrobial activities of valex (the extract of valonia), the extracts of mimosa bark, gallnut powders, Salvia aucheri Bentham var. aucheri and Phlomis bourgei Boiss were studied. The antimicrobial activity of the above plants was evaluated by the disk diffusion method using Bacillus brevis FMC 3, Bacillus subtilis IMG 22, Bacillus cereus EÜ, Escherichia coli DM, Pseudomanas aeruginosa DSM 50071, Staphylococcus aureus Cowan 1, Listeria monocytogenes A, Micrococcus luteus LA 2971, Klebsiella pneumoniae FMC 5, Mycobacterium smegmatus RUT, Proteus vulgaris FMC 1 bacteria, and Alternaria alternata MDC 97, Penicillium italicum MDC 101, Fusarium equiseti C, Candida albicans CCM 314 fungi. The results indicated that mimosa bark extracts had the greatest antibacterial activity, followed by the valex, gallnut powders, Salvia aucheri var. aucheri and Phlomis bourgei extracts, respectively. Furthermore, it was found that gallnut powders and the extracts of mimosa bark contained high amounts of tannins and show...