There is certainly presently no solution to buy weed. There won't be any cannabis merchants. You need to grow it yourself or sign up for a cannabis club. Another way of having weed in Berlin is with the Avenue dealers found in Görlitzer Park and Volkspark Hasenheide. Even so, https://wheretobuyweedinberlin53073.wikicommunication.com/5232617/indicators_on_where_to_buy_weed_in_berlin_you_should_know