The Space Greenhouse Program (Spagreem) is a project that develops a greenhouse for growing fresh food in the extreme conditions of Mars. We've chosen a Bolivian plant named Prickly Pear ("Tuna" in Spanish) that grows in extreme conditions in the Bolivian Altiplano. This plant has beem chosen not only because it can grow up in extreme conditions, but also, for the nutritional value and healthy properties that provides.  This project aims to develop the concept of a greenhouse in Mars, capable of growing prickly pears in order to provide fresh foods for astronauts as a complement for the food supplies during space missions. The project will use a greenhouse in which all the conditions will be monitored (Temperature, Humidity, Pressure) continuously