How did the flowers lose their leaves?

There are many reasons for flower leaf loss, most of which are caused by excessive soil moisture, soil water shortage, soil Alkalization, improper fertilization, lack of light, diseases and insect pests. The watering times of flowers need to be controlled when breeding, each watering only needs to keep the soil moist, but there is no stagnant water, it needs to be diluted when fertilizing and then applied, and when the sun is exposed at noon, it needs to be moved to the place of astigmatism for breeding. most of the diseases and insect pests are caused by red spiders, whitefly, black spot and deciduous disease, and the right medicine should be taken after cleaning up diseased leaves.