You can find currently no way to buy weed. There won't be any cannabis merchants. You have to mature it on your own or be part of a cannabis club. Yet another way of obtaining weed in Berlin is in the Avenue sellers present in Görlitzer Park and Volkspark https://dallasrfsdn.buscawiki.com/1405015/considerations_to_know_about_where_to_buy_weed_in_berlin