Bolivian Rainbow Chili is one of the ornamental chili varieties which is unique in the form of its colorful fruit color. The vegetative growth of ornamental chilies requires additional nutrients and the role of microorganisms to obtain optimal growth. This study aims to determine the optimal growth of rainbow chilies using the application of PGPR biological fertilizer, a combination of PGPR biological fertilizer and NPK synthetic fertilizer, as well as a combination of PGPR biological fertilizer and compost organic fertilizer. This research was conducted with a completely randomized design (CRD). The data obtained were then analyzed by ANOVA and continued with the LSD test and Duncan’s test at the 5% test stage. The results showed that the combination treatment of PGPR and compost or PGPR and NPK provided optimal vegetative growth compared to single PGPR treatment.