Last Sunday, my family and I made the trip out to the Recreational Park Marzahn to check out the Gardens of the World. Due it only being January we could enjoy the grounds and only dream of how beautiful everything is in summer.
 http://www.gruen-berlin.de/parks-gaerten/gaerten-der-welt/ueberblick/,

here are some websites for more information:

http://www.berlin.de/stadttouren/360/chinesischer_garten/index.en.php

http://tourist.visitberlin.de/en/spot/marzahn-recreational-park-gardens-of-the-world