The Arc/Berries

On the Arc, you can find and breed berries of various types. Rumberries have a significant use outside trading as it's required in Tuai Leit's Own and is an ingredient for making Arc gumbo, but finding all berries (listed in the Arc Journal) is required for the final Arc unlock.

Eating a berry provides temporary stat boosts. All berries can be sold to Terri (fruit merchant), found in the gnome encampment in western Tuai Leit, or Sinuman (food merchant) on Cyclosis.

Cross-pollination
In order to obtain any berry besides rumberries and exuberries, you need to either find a seed in a rare Uncharted Isles chest or cross-breed them in the farming plot in central Tuai Leit.

You can add two seeds to the patch to cross-pollinate and grow mature bushes. Harvesting when both plots in the patch are mature after approximately 42 hours rewards some new berries and seeds.

Types
These berry cross-pollinations yield no result: