Osmanthus fragrans, whether cultivated in pot or in the open field, generally enters the vigorous growth period after the spring shoots germinate, which is also called vegetative growth period. During this period, the leaves are mainly ornamental. Therefore, nitrogen and potassium fertilizers should be applied mainly, supplemented by other fertilizers, once a month in the open field and twice a month in the flowerpot. Osmanthus fragrans absorbed a lot of nitrogen and potassium fertilizer, and its leaves were bright and green, with good photosynthesis, prolonged functional period of leaves and strong plants. After June, osmanthus fragrans will enter the stage of flower bud differentiation. At this time, nitrogen fertilizer can no longer be applied, and phosphorus and potassium fertilizer should be given priority to, supplemented by other fertilizers. Phosphate fertilizer can form anthocyanin (or carotene), promote flower bud differentiation and meet the needs of osmanthus fragrans flowering. The principle of topdressing is: look at the growth, determine the dosage, and apply thin fertilizer frequently. Specifically: lean fat is to take three parts of fertilizer solution and mix seven parts of water; You can also mix one or two parts of fertilizer solution with nine or eight parts of water. Frequent application means applying it every 5 ~ 7 days, which means long and fixed dose.