Kasgot fertilizer is the result of the decomposition of organic waste with BSF (Black Soldier Fly) larvae which has a sustainable effect on integrated farming systems. This study aims to determine the effect of the application of kasgot fertilizer originating from various BSF food sources on increasing the growth and yield of spinach plants (Amaranthus tricolor L.). The research was carried out using the Randomized Block Design (RBD) method with one factor: the planting medium added with kasgot fertilizer from various BSF food sources such as organic waste from markets, tofu waste, food leftovers from restaurants, and chicken manure. This planting medium had previously been applied for mustard cultivation for two months. There were six treatments with four replications. Several variables, such as plant height, number of leaves, leaf area, plant fresh weight, plant dry weight, water content, and soil chemical analysis, were observed in this research. The results showed that kasgot fertilizer had a significant effect on the variable of plant height, number of leaves, leaf area, plant fresh weight, plant dry weight, pH H2O, total N, and P2O5. Meanwhile, the fertilizer had no significant effect on the variable of water content, organic C, C/N ratio, and available K.