This experiment is so satisfying because it provides results very quickly. You can do it with any white cut flowers (I used iceberg roses from the garden). A good experiment to prove that plants drink water and that water travels upwards from the stem to the petals.

You will need:

  • A few white roses or carnations work well
  • Two glasses
  • Water
  • Blue and red food colouring

What to do:

  • Half fill each glass with water
  • Put approximately half the bottle of food colouring in each glass, making the water in one red, and in the other blue
  • Now place a flower in each glass and wait to see what happens. Within 1 ½ – 2 hours the flower should have a blue or red hue and then the edges of the petals should start changing colour