The main purpose of the present invention is to provide a plant Lactobacillus PM229, which was identified as a novel strain and was deposited at the Food Industry Development Research Institute of Taiwan Foundation on October 4, 2018 under the deposit number BCRC910853. The plant Lactobacillus PM229 series has the effect of inhibiting the growth of microorganisms, in particular, it can inhibit acne bacteria.本發明之主要目的在於提供一種植物乳酸桿菌PM229,係被鑑定為一新穎菌株,於2018年10月4日寄存於台灣財團法人食品工業發展研究所,寄存編號為BCRC910853。該植物乳酸桿菌PM229係具有抑制微生物生長之功效,尤其是能夠抑制痤瘡桿菌。