I'm working with a group of artists, educators and engineers to develop new methods for STEM teaching in classrooms and museums. Right now, we are trying to design a room-sized model of the carbon cycle that illustrates the relationship between oceans, biosphere and atmosphere. As part of this, we want to have a tree growing hydroponically (tree will not be very large, aiming for more sapling-scale).
Does anyone know whether it is possible to grow larger plants hydroponically, and if so, what the biggest challenges do doing this are?