Palm oil is one of the most important vegetable oil. The extraction and purification process create a lot of waste and is known as palm oil mill effluent or POME. This research paper reviews the efficiency natural coagulants for the treatment of POME with cacti species and zeamaize. Temperature, initial pH, mixing time, mixing speed and coagulant dose were the constant parameters throughout the experiment. Further treatment efficiency was determined by pH, conductivity, alkalinity, Turbidity, hardness, TDS, TSS, oil and grease, BOD and COD of the sample are estimated by standard method. The result of this work indicates that both these traditional plants may contribute the treatment efficiency with respect to their potential characteristics. The significance of the study was also carried out by the correlation analysis.