Students watch plants transform colors before their eyes during this mini-experiment! I use this lesson as an introduction to vascular plants before beginning the unit. Students go through the steps of the scientific method to make a prediction about what it means for a plant to be vascular. Typically, I use either white carnations or celery stalks, and do the experiment on a Friday so that the plants can sit in the food coloring over the weekend. However, you can also choose to do the experiment over a few days during the week so that students can check to see the progress of their plant! Customize it to your class and what effect you would like to accomplish! This lesson takes VERY little prep-work, and the students go crazy for the result!