As a science / Spring activity Lizzy and I picked up carnations at the grocery store to do the color changing carnations experiment. Lizzy cut all the carnations to put in colored water. I used 12 drops of food coloring but I think I should have used more to get a better result. The carnations "drank" the colored water and Lizzy could see this in the changing carnation petals. The yellow and green worked best for us for some reason. Try this simple experiment at home to teach how plants absorb water and learn about plant growth.