The lotus is open during the day and closed at night. Because it can't bloom without sunshine, and there is no sun at night, so it can't carry out photosynthesis and produce nutrients. In addition, the temperature at night will be reduced and the heat will be consumed, so the flowers will close. This phenomenon is also called the sleep movement of plants. Because of this phenomenon, the nutrients and water in the body will not be lost. Its flowering period is mostly between June and September.
