I work for a school district in Kansas. Some of us, who wanted to work with it, were provided an extremely nice Tower Garden from Juice Plus+. It has all the bells and whistles including a very nice light kit. What we produce in the tower will be served to the kids getting lunch in the area during the summer. During the school year it will be served to students in the schools. We won't be able to produce enough for every school but may do a round robin type thing.
The Tower Garden is a hydroponic unit, meaning your plants grow without dirt. It uses water and nutrients that you add. The pH needs to be kept fairly neutral as well. That is all down in the bottom part and there is a pump inside that pumps the liquid up to the top in that center tube and it runs down the insides and keeps the plants moistened. The outer structure is called a "tomato cage".
This first photo shows the tower assembled and waiting for the light kit and plants.
Additional update, we have tomatoes! In addition to the plants growing so tall we have actual tomatoes! My buzzing the flowers like a bee has actually worked. I am very happy. You can see them in the upper/middle left of the image, especially if you view it large.