After buying a land box, you will unpack to find out the Rarity of your land, and seasons there are on it. By unpacking, you will get a brand new land at level 01 with 10 growing plots. However, Land Rarity can be randomly between Common <-> Immortal.
If you are buying Lands already Unpacked, please check carefully it’s current level and how many Seasons attributed (It will affect to what kind of growing items can grow), Carefully choose the Rarity (It will reflect in Growing Time reduction and Mutation Rate aspects).
The current level of the Land will indicate how many plots are unlocked for you to grow items.