Crop mastery in Farmville results in you getting a sign to place on your farm to show others you have harvested a significant number of that particular crop. Your crop will not yield any more money per sale than it would before. These signs are more a status symbol amongst those who play the game.
Many people try to collect as many signs as possible. There are some signs that are more difficult to acquire as the crops are not always available for purchase, meaning you only have a particular window in which to earn the sign. You have a choice to place your mastery .
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