In Elementales, berries can be used to improve your elemantors in different ways. Like for example, increase its ATTACK, its SPECIAL ATTACK, etc..

Those berries can also be planted all around Ellion, in specific pots found in the different cities. Those pots are silver colored.

Once a berry is planted, it will need a couple of hours in order to fully grow and in order for you to be able to pick up the berries that have grown. Normally, planting berries will yield around 3-5 of the berry planted. You can then replant the same berry in the same place again or in a different pot.