This study aims to examine the effects of using different types of mulch and potassium fertilizer dosages on the growth and yield of white waxy corn (Zea mays ceratina). The research was conducted in the experimental garden area of Robyong Hamlet, Wonomulyo Village, Poncokusumo District, Malang Regency, from December 2023 to April 2024. The method used was the Split Plot Design (SPD) with the main plot being the type of mulch (no mulch, rice straw mulch, and black silver plastic mulch) and the sub-plot being the dosage of K2O fertilizer (80, 120, 160, and 200 kg K2O ha-1). Each treatment was repeated 3 times. The results showed that the use of black silver plastic mulch (MP) significantly increased plant height, leaf area, total dry weight, and leaf area index compared to no mulch (TM) and rice straw mulch (MJ). A K2O fertilizer dosage of 200 kg ha-1 gave the most optimal results for all growth and yield parameters of corn. The interaction between the use of plastic mulch and higher potassium fertilizer doses (K200) resulted in the highest average yield of 18.90 t ha-1. In conclusion, the use of plastic mulch and the appropriate dosage of potassium fertilizer are essential to support optimal growth and high yields of white waxy corn. The combination of plastic mulch and higher K2O fertilizer dosage enhances water and nutrient use efficiency, supporting optimal conditions for plant growth.