Board Thread:Questions and Answers/@comment-66.191.88.177-20131202035733/@comment-3153244-20131204053954

96.41.160.139 wrote: Also you need the Micro Agriculture Development Building. I believe its available at lvl 15. Once you have it you can buy as many banana farms for the battle game as you have in your city out of battle. Yes, that's what I was talking about.

One extra city farm quota every 5 levels.