Using the base of the celery, and not just individual stalks was really interesting. The celery drinks from the outside edge only, and not from the center. I didn’t know that, but it makes a lot of sense, because that is where the rain water would most likely be. Perhaps this is also why the center stalks in celery are more yellow and the outside are more green, the outside stalks get more water. Maybe we will find out in a future experiment.
We also cut the stalks and showed the colored strands where the water had traveled to the leaves. My children loved this experiment.