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The first is the physiological reason: In the early flowering period, due to vegetative growth and reproductive growth at the same time, the inflorescence can not get sufficient nutrition and easy to fall. In the late growth period, the plants are weak, and the lack of nutrients in the leaves is also easy to cause falling; second is the environmental conditions: Temperature above 30 °C in the flowering and poding season, or below 15 °C will affect the pollination and cause the fall of flowers. In the flowering period, the air humidity is too low or too high. In case of rain, it will also affect pollination and cause flowering. Insufficient sunshine will cause poor plant growth and cause the fall of flowers. Third, cultivation and management: too much nitrogen fertilizer, so that nutrient growth is too prosperous; fertilizer is insufficient, resulting in malnutrition, serious diseases and insect pests, etc., will cause falling flowers and falling out.