Urban agriculture can mean a lot for a city population. Not only can it provide local food, but it can also create a social landscape in a city.
And Prinzessinnengarten in Berlin does exactly that. Since 2009, a collective called "Nomadic Green" rents a 6000 sqm plot at the Moritzplatz in Kreuzberg. The site has been a wasteland for about 50 years, but with relatively small means it has been transformed in an idyllic urban garden. Not only do locals maintain the garden themselves - thus creating a stronger sense of community in a relatively socially weak area of the city - but it also produces local (healthy and organic) food. Even more so: at Prinzessinnengarten, they strive towards a larger biodiversity. They try to cultivate rare species of plants.
Since the site is only rented, it cannot be a permanent garden. So most of the vegetables are planted in old crates from bakeries, or in large bags. In case the rent is ended (for whatever reason), most of the Prinzessinnengarten could be easily transported to another site. Other than that, by doing so, one doesn't depend on the local soil, since it might not be in the best condition after being wasteland for such a long period of time.
But besides the plants, the food and the greens, the community aspect of the project is quite important. It gives the locals a place to work on food production together, it is a place to educate kids about food, a place to eat together, a place to hang out in a green spot amidst all the concrete and a place that ties extremely different people together. And the idea seems so simple (albeit difficult to actually do, I assume).
Prinzessinnengarten is launched as a pilot project by Nomadic Green, so let's hope that there are many more projects to follow. By them, but also by people that are inspired by their acts.