We found a neat website that had an experiment that would help us answer this question.
http://www.sciencebuddies.org/science-fair-projects/project_ideas/PlantBio_p033.shtml#background
Celery also worked well.
Most of the time, plants get their water from the ground. This means that the plant has to transport the water from its roots up throughout the rest of the plant. How does it do this? Water moves through the plant by means of capillary action. Capillary action occurs when the forces binding a liquid together (cohesion and surface tension) and the forces attracting that bound liquid to another surface (adhesion) are greater than the force of gravity. The plant's stem sucks up water much like a straw does. A process called transpiration helps the capillary action to take place. Transpiration is when the water from the leaves and flower petals evaporates, or, in other words, the water leaves the plant and goes into the surrounding air. As the water evaporates, the plant pulls up more water. (from www.sciencebuddies.org )
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