How can I expand to 24x24 I don't have 30 neigbours and no farmcash?

There's no shortcut to do it. You have to follow the legal steps (in order to not get banned by zynga) in order to level up at farmville. And in order to do that, you should plant more crops, harvest everything you have in your farm and invest your money again in order to buy bigger items.

You can only buy the items you want when you have reached the required level, have met the required number of neighbors and if you have the money enough to buy them. I myself am at level 34 now but still can't upgrade my farm to 24x24. I have more than 30 neighbors already.

I'll try to see if I can upgrade my farm when I reach level 35. I'm getting there so soon...

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