How close together can I have my Warre Hives?
The bees are extremely good at knowing the precise location of their hives, and there seem to be no repercussions of having hives spaced as little as 1-2 feet away from each other. With hives in close proximity you may see more late season robbing of the strong colony on the weak. This can be mitigated by the use of mouse guards: http://www.beethinking.com/products/warre-hive-mouse-guard
I hope this helps!