Why Do Flowers Close Up at Night?
Many flowers have petals which are open during the day, but which close up at night. These flowers are reacting to light or temperature changes. Other flowers, however, remain open around the clock, while still others have unusual opening and closing habits. But these habits are all related to light or temperature changes. Here’
Not all plant do, but for those that do this, one big advantage is that it keeps the pollen dry if the plant is in a humid environment and dew forms as the temperature cools overnight. This makes the pollen easier to pick up by the insects (or other pollinators) that may visit the flowers early in the morning. It can also protect the pollen from being brushed off or falling off if the flower is bumped into by accident by an animal which isn’t a pollinator, so it increases the chances of the plant being able to reproduce.
