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Changing the Color of FlowersFeatured science projectScience project video


Reviewing your completed chart and the flowers, what can you conclude? As you can see the two flowers placed in the dyed water have completely changed color. Also you can observe that all three glasses have much less water in them compared to yesterday. How does the dye in the water transfer to the color of the flower pedals? With the stem being cut at an angle instead of straight it allows more water to be pulled up the stem. If cut straight it could sit flat on the bottom of the glass which would greatly reduce the amount of water being pulled up the stem.

As the 24 hours pass the water molecules on the surface of the leaves and flower pedals evaporate. Cohesion between the molecules causes water in the glass to be pulled up the stem to replace the evaporated water on the leaves and flower pedals. This transpiration is what allows us to change the color of the flower pedals. Without transpiration flowers would be deprived of the nutrients found in soil that are vital to their survival and the process of photosynthesis.

Questions & Answers

How does placing a white flower in colored water change the color of the flower?

Through the process of transpiration the dyed water travels through the stem and onto the flower pedals.

What makes the flower keep on ""drinking""

Cohesion when the water on the surface of the leaves and flower pedals evaporates.

How can the angle of the cut stem affect its ability to intake water?

If the stem is cut straight it might lay flat at the bottom of the glass and pull up less water, with a cut angle, the stem will receive constant water.

Make it Your Own

Does having dye in the water effect the amount of water consumed by the flower in a 24 hour period? Compare the water levels of the two different colors used in 24 hours to the clear water levels. Is there a difference?

Want to get creative? Want to dye a flower two different colors at the same time? Evenly cut the stem of the flower in the middle all the way up to the flower, stop cutting about half an inch below the flower. Then place each piece of stem into two different colored glasses. Wait 24 hours and see how two different colors dye the pedals. Record the patterns the different colors make.

In this project you successfully dyed a white daisy. Is it possible to turn it back to white? After the dying process is over place your dyed daisy into 2 cups of fresh clear water, just like in the original project. Wait 24 hours. Has the daisy's color changed? Is it faded? If it still has some color in it then wait another 24 hours. Record all of your observations.


A great place to start researching terms important for this project is the encyclopedia.

1998. "Botany: Plants Parts and Functions" The University of Arizona, College of Agriculture. 12/06/13

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    Complexity level:
    Project cost ($):
    Time required:
    Once preparations are finished, the flowers will sit for at least 24 hours, then conclusions will be made after.
    Material availability:
    Safety concerns:
    Safety guidelines for cutting flower stems should be followed.