You can work there in the organic garden and plant salads or other veggis and after it you even can harvest a bit! If you are not up to garden work, just take a vegan lunch there and make an organic shopping tour with harvesting for youselve! It`s always a visit worth!
At the moment its future is in danger, like it is for many other cultural places in Berlin. If you want to do something against it, and want to help, that a great place like this, will be there for all, you can sign a petition at the moment on the website of Prinzessinengarten!
Its at metrostation Moritzplatz in Prinzenstraße 35-38, Kreuzberg