Although I'm not sure, I believe that you need to reach a Three Star Mastery on a crop before you can fertilize and you may only be able to fertilize the crops that you've mastered.
You can't !!!!
If your on farm ville that's on face book you can ask your friends to send you free stuff!
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As far as I know, there's no way for you to open farm ville on Twitter. Farm ville is an application for facebook, thus allowing only facebook users to access that.
you get one buck each time you go up a level, or you can purchase them with a credit card or paypal
farm ville, frontier ville, and millionaire city
yes, is for free
you can't
There's farmtown.
A scam, don't do it.
You get to level 16.