Abstract: The use of organic fertilizers as an alternative to chemical fertilizers is one way to reduce the use of chemical fertilizers which have negative effects when used for a long time. This study aims to determine the effect of liquid organic fertilizer on the growth of pepper plants. This study used a completely randomized design (CRD), which consisted of 6 treatments with 4 replications, namely control P0 (0 ml), P1 (100 ml), P2 (200 ml), P3 (300 ml), P4 (400 ml), P5 (500 ml). The variables observed in this study were plant height, number of leaves, dry weight, and fresh weight. The results of the study showed that the application of liquid organic fertilizer from banana peels affected plant height, number of leaves, fresh weight and dry weight of pepper plant. P5 treatment (500 ml) is the best concentration for increasing the growth of pepper plants.