Why does the loofah flower bloom at 7 pm?

Because the temperature and humidity at that time were suitable.

Most melon flowers are unisexual, that is, male flowers and female flowers are produced on the same plant respectively. Generally, there are male flowers first, then female flowers. The time of bloom for both sexes is after the dew dries every morning, from 7: 00 to 9: 00 on sunny days, and when the humidity is high and the temperature is correspondingly low on rainy days, it will be delayed until after 10. The flowering period is short. Generally, after 24 hours, the corolla naturally withers, the stigma turns brown, and the ability of germination and pollination is gradually lost. Pollen grains can germinate before anther opening 1 day, so they can be pollinated and fertilized. However, the most fertile period is when the corolla is in full bloom, so we must seize this opportunity when conducting artificial pollination or hybridization. The occurrence of male and female flowers of Luffa has certain regularity, which is closely related to its variety attributes. Generally speaking, male flowers differentiate earlier and are planted in lower nodes of plants. Female flowers differentiate late and have high node position. Generally, early-maturing varieties are planted in the axils of 4-5 nodes, and middle-late-maturing varieties are planted in the axils of 8-9 nodes. In addition, the nodes produced by female flowers are related to temperature and light. According to the emergence of Luffa in winter in recent years, under the condition of low temperature and short sunshine, the nodes of female flowers in early-maturing varieties decreased and those in middle-maturing varieties decreased by 4-5 nodes. In cultivation management, early management should focus on preventing loofah from dropping seedlings.