Synopsis
In 1983, the Korean immigrant Yi family moves from California to their new plot of land in rural Arkansas, where father Jacob hopes to grow Korean produce to sell to vendors in Dallas. One of his first decisions is to decline the services of a water diviner and he digs a well in a spot he finds on his own. He enlists the help of Paul, an eccentric local man and Korean War veteran. While Jacob is optimistic about the life ahead, his wife Monica is disappointed and worries about their son David's heart condition; he is frequently told not to run due to this. Jacob and Monica work sexing chicks at the nearby hatchery and argue constantly while David and his sister Anne eavesdrop.
To help watch the children during the day, they arrange for Monica's mother Soon-ja to travel from South Korea. David, who is forced to share a room with her, avoids her because she does not conform to his idea of how a grandmother should be. Still, Soon-ja attempts to adjust to life in the States and bond with the children. The well that Jacob dug runs dry. Jacob is reluctant to pay for county water, but eventually is forced to do so. He runs into additional difficulties, such as the vendor in Dallas cancelling their order at the last minute. Even so, he perseveres despite Monica's vocal desire to return to California. This brings their marriage closer to breaking point.
Meanwhile, Soon-ja takes David to plant minari seeds by the creek. She tells him how resilient and useful the plant is, and predicts plentiful growth. David finally begins to warm to his grandmother after she teaches him hwatu, bandages his wounds, and soothes him to sleep. Soon-ja also encourages him to do more physical activity, something his parents discourage, but she says that he is stronger than they think. Soon-ja suddenly suffers a stroke overnight. She survives with medical treatment, but is left with impaired movement and speech.
Jacob, Monica, Anne and David head to Oklahoma City for David's heart appointment and to meet a vendor to sell Jacob's produce. Although they learn that David's heart condition has dramatically improved and Jacob makes a deal to sell vegetables to a Korean grocer, Jacob also indirectly admits to Monica that the success of his crops is more important to him than the stability of their family. Following an emotional argument, the two tacitly agree to separate.
However, Soon-ja accidentally sets the barn containing the produce on fire in their absence. Upon arriving home, Jacob rushes in to save the crops, and Monica soon follows. Eventually, the fire grows out of control, and they decide to save each other while leaving the barn to burn. A distraught and confused Soon-ja begins to wander off into the distance, as Anne and David call for her to come back. Seeing that she is not responding to them, David breaks into a sprint to meet her, blocking her path. Soon-ja seems to recognize David for a moment, and reaches for his hand and the grandchildren lead her back home. Th