Nitrogen is an essential element for the growth of flowers. Application of nitrogen fertilizer can promote the growth of leaves and leaves. However, for winter dormant flowers, the application of a large amount of nitrogen fertilizer in autumn will induce the occurrence of autumn shoots. It will not only consume the nutrients stored in the flowers, but also The flowering and flowering of flowers in spring will also be affected, and because the dormancy time of flowers after the autumn shoots will be postponed and will cause freezing damage when exposed to low temperatures, it is necessary to apply phosphorus and potassium fertilizers to the dormant flowers in winter. Phosphorus and potassium fertilizers can promote the accumulation of nutrients in flowers and lay the foundation for growth and flowering in the second year. However, it is not possible to use nitrogen fertilizer in the autumn, and it is still possible to apply nitrogen fertilizer to flowers that are not dormant in the winter. In particular, the foliage-based plants should still use nitrogen-based fertilizers. However, in the application of nitrogen fertilizer should pay attention to the combination of phosphorus and potassium fertilizers. Reasonable application of P and K fertilizer can improve the cold resistance of flowers. Winter flowering plants such as cineraria, cyclamen, poinsettia, and waxberry are vegetative stages in the early autumn, and nitrogen-based fertilizers should be applied. Most of the late autumn is during the period of budding, phosphorus and potassium fertilizers should be used for fertilizing such flowers, supplemented by nitrogen fertilizer, too much nitrogen fertilizer is not conducive to winter flowering.