Why do some flowers close at night?

Why do some flowers close at night?

Look at a garden in the day. Flowers are open. Colors are bright. Bees and butterflies fly from flower to flower. They look for sweet food.

Now look at the same garden at night. Some flowers are closed. They look like little green cups. Why do they do this?

The main reason is safety. Nighttime is cold. The air gets chilly. Wind can blow. Dew falls on the ground. If a flower stays open, its delicate inside parts can get hurt. Closing protects the plant.

Another reason is energy. Flowers need to save their energy. In the day, the sun shines. Insects can see the bright petals. At night, it is dark. Insects cannot see flowers easily anyway. Opening at night is a waste of time and power. So, the plant rests.

Some flowers also close to keep their powder safe. This powder is called pollen. Insects carry pollen to other plants. If night rain gets on the pollen, it becomes wet and heavy. Bugs cannot move wet pollen. Keeping it dry inside a closed petal is a smart trick.

How do flowers know when to close? They have a natural clock. Some flowers close when the sun goes down. Others close when the temperature drops. This movement has a special scientific name: nyctinasty.

When morning comes, the sun warms the air. Light hits the petals. The flower opens again. It is ready for a new day of busy bugs and bright sunshine.

What is your favorite flower?