 The experiment aimed to determine the effects of three foliar biopreparations, bioalgene, herbogreen basic, and effective microorganisms on yield and quality of organically grown garden time thymus vulgaris. Bioalgene increased time productivity, while effective microorganisms had no impact. The biopreparation stimulated an increase in essential oil content and natural antioxidants in the thyme herb, with bioalgene having the greatest positive influence on quality. This article was authored by Césarier-Quietkowski, Mao Gorjata-Hilliniars, Elsbieta Harrison, and others.