Where does food come from?

We are basically trying to use 'lost' space around the school on floors and walls to grow food and show students that food does not come initially from supermarkets. It supports one of the IB PYP units of inquiry which is the title of the programme. It also supports a child nutrition centre that our school owner, Pilar Deza, founded in an extremely poor area of Lima quite close to the school, http://www.coninperu.org/.