What About Tulip Flowers? Tulip flowers open and close in response to heat and light. When tulip petals fold in at night, or on a rainy day, the pollen stays dry and reproductive parts are protected. When they open the next morning, the pollen is ready to attach to the bodies of hungry insects.

Why are my tulips opening so much?

Why do tulips keep growing in water? Tulips are really responsive to sunlight and that's why they move. They're turning themselves towards the light sources around them, hoping to be seen by pollinators. You might also spot them opening up on sunny days and closing up at night time.

How do you keep tulips from opening?

To keep cut tulips fresh and vigorous, be sure to keep the water in the vase “topped off” with fresh cold water every day or two. Flowers kept in a cool location in a room will also last much longer. Change the water completely every couple of days to prolong your flower's life.