However, that is not entirely true! Crop Mastery exists in FarmVille 2, but you need to unlock it first by reaching level 7 in the game. As soon as you get enough experience to reach level 7 in the game, you will unlock crop mastery as well, and you will see a new icon near each crop, as well as be awarded with mastery signs as soon as you get the first star for any crop.
Crop Mastery functions in FarmVille 2 exactly as it does in FarmVille, meaning that you must harvest a specific number of crops in order to earn a new star (which, in this case, is a ribbon). There are 3 mastery levels and each of its crops has its own requirements, so you should feel at home with mastering the crops of FarmVille 2.