1. Fertilization in summer The temperature is high in summer, and most flowers have poor growth potential. Flowers that are not resistant to high temperature, such as short string red, Petunia, Hibiscus, Clivia, etc. In summer, when the temperature is high, the growth is slow and the requirements for fertilizer are not high. At this time, fertilization should be stopped. If the cooling conditions are good, the flowers can be fertilized when they can grow normally.
Due to the high temperature in summer, some semi-dormant flowers, such as rose and cyclamen, should stop fertilizing, and then start fertilizing after the temperature drops and returns to growth; For some high-temperature resistant flowers such as zinnia, Catharanthus roseus, Celosia cristata, gladiolus, sunflower and so on. Summer is the peak season for their growth and flowering, so we should use fertilizers normally. However, due to the high temperature in summer during the day, fertilization should be chosen in the early morning or evening, and the concentration of fertilization should also be controlled to prevent root burning.
It should be noted that the leaves of flowers should be washed with clear water immediately after fertilization to prevent the fertilizer sprinkled on the leaves from burning the leaves; Aquatic flowers such as water lily and bowl lily can also be fertilized normally in summer, and the decomposed fertilizer can be buried in the root soil, so there is no phenomenon of burning roots and leaves.
2. Fertilizing nitrogen in autumn is an essential element for flower growth. Applying nitrogen fertilizer can promote the growth of branches and leaves, but for flowers that are dormant in winter, applying nitrogen fertilizer in large quantities in autumn will induce the occurrence of autumn shoots. The occurrence of autumn shoots will not only consume the nutrients stored in flowers, but also affect the growth and flowering of flowers in the next spring. Moreover, because the dormancy time of flowers will be delayed after autumn shooting, freezing injury will occur when encountering low temperature, so phosphorus and potassium fertilizer should be applied to flowers that are dormant in winter in autumn. Phosphorus and potassium fertilizer can promote the accumulation of nutrients in flowers and lay the foundation for the next year's growth and flowering.
It is not impossible to apply nitrogen fertilizer in autumn, but flowers that are not dormant in winter can still apply nitrogen fertilizer, especially foliage plants. However, when applying nitrogen fertilizer, we should pay attention to the coordination with phosphorus and potassium fertilizer. Reasonable application of phosphorus and potassium fertilizer can improve the cold resistance of flowers.
Plants that bloom in winter, such as Guayeju, calceolaria, Cyclamen persicum, Poinsettia, Chimonanthus praecox, etc., are in the vegetative growth period in early autumn, and should be mainly applied with nitrogen fertilizer, while most of them are in the bud stage in late autumn, and should be mainly applied with phosphorus and potassium fertilizer, supplemented with nitrogen fertilizer. Excessive nitrogen fertilizer is not conducive to winter flowering.
Conclusion: After reading this article, everyone should know how to fertilize flowers in summer and autumn. As long as the above principles are followed in order, elegant flower cultivation is not a problem.