You can grow and farm your own crops in NieR Replicant. This guide on How To Unlock Farming In NieR Replicant Ver1.22 explains how you unlock the ability to farm your own foods, so you can grow various items and either use them or sell them on for great profits.
Eagle eyed players may have already located the fields. You will find the fields sitting directly next to the protagonists house. However, they are locked at the earlier stages of the game. Even if you gather seeds and other farming materials, you will not be able to plant them until you complete a specific side quest.
How To Unlock Farming In NieR Replicant Ver1.22
After you find Grimoire Weiss and save your sister, you will return to your village. Once you’re back in the village you will speak with the singing lady at the fountain who will direct you to speak with someone else. After you finish with that part of the story, you will unlock the ability to do side quests. Once you’ve unlocked side quests, head into the castle-like area of the village, with the high walls, where most of the villagers are found.
There’s a quest inside the village area. Speak with the woman sitting on the bench, she will give you a quest Shopping List. The main story will soon direct you to Seafront. Once you get there, be sure to speak to the green grocer and purchase the 3x Tulip Bulbs. Once you have three of these, return to the lady in the village and hand in the quest. This will unlock the ability to use the farms at the protagonists house.