Do you want to work with us in our Permaculture forest garden? There are basically 4 ways to get involved; I am writing in English, but you can apply and write also in German. 
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1. Internship/stage/Praktikum: a Long(er) term learning experience in exchange for your practical help. You should be able to differentiate between the most important plant families and to learn all the wild plants in our garden. Most of your work will be: foraging/picking leaves for the restaurant, cleaning beds and paths, permaculture weed management (involving a lot of manual work), watering, but also sowing, planting and composting. You will have to work very much on your own  - supervised by permaculture gardener and educator Martin Höfft via phone/Email and in cooperation with the cook and the café service staff. This internship should last 3 to 6 months between February and December. You should be available for 2-3 hours on 3-4 days per week, including either saturday or Sunday, when Martin is also available. Other setups are possible. You will receive a certificate. Application with CV and short motivation letter per Email to: garten@cafe-botanico.de with subject "Praktikum".
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2. If you want to be part of a wider circle of volunteers and help or join for occasional events, you can send an email with your Whatsapp number and/or better join this Facebook group:
Here we are offering occasional gardening activities according to the season, mostly on the weekends, 2-3 hours of work in the group and some infos and skills about plants and permaculture gardening.  
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3. If you have experience with Central European wild herbs, foraging and permaculture gardening, you can apply for a part-time gardener position (app. 5 - 10 hours per week, eventually more, mostly harvesting and permaculture weed management and stacking). Write an email with CV and demonstration of your skills and Mention "Job als Permakulturgärtner/gärtnerin" in the subject.
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4. In addition, we are open for cooperations with gardeners who are interested in planting and harvesting wild herbs and vegetables for our restaurant in their own gardens or to start cultivating additional beds and fields in the Berlin area. If you have access to allotments, gardens or other agricultural areas, and want to become a supplier for us, please write to garten@cafe-botanico.de with subject "Kooperation mit Botanico". We can also help you setting up a permaculture garden, provide you with plants, seeds and ideas.