Colour Changing Flowers

08 Apr 2021

Colour Changing Flowers

Colour Changing Flowers Science Project

Do you know that flowers can drink up water and change their own colours into the colour of the water they drink?

This colour changing flowers science experiment for kids is such a fun science project. Kids will be fascinated as they watch the flower petals changing colour and learn about how plants drink water! The rainbow-coloured flowers look so pretty too!

What you will need

  • White/light-coloured flowers such as white roses, carnations, or daisies. You can use any white flowers for this colour changing flower experiment.
  • Food colouring.
  • Several glasses, vases, or test tubes.


  1. Pour water about halfway in each of the glass jars and then add a few drops (5-10) of food colouring to each jar. The more colouring you add the deeper the colour on the flower petals will be.
  2. Trim the stem off the flowers so they fit your cups or glasses.
  3. Add at least one flower to each glass of coloured water.
  4. Check-in on the flowers every couple of hours and observe any changes. Keep them in a cool place overnight.

The flowers won't change colour instantly, but after an hour or so you will start to see a little colour appearing on the petals. After a few hours, the petals will all begin changing colour and if you leave the flowers in the coloured water overnight the colour will continue to get deeper.

If you use flowers such as daisies that take longer to do this experiment, change the water entirely every 2-3 days to keep the flowers fresh for longer.

This easy science experiment gives you the perfect opportunity to talk to your child about how a plant drinks water. The coloured water used in this experiment demonstrates how water is sucked up through a plants stem and then makes its way to the different parts of the plant including the flower. 

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