While nationality isn't directly addressed, it's implied through the characters' backgrounds and experiences:
* Leona, the protagonist, is African American.
* Kim, her neighbor, is Korean.
* Virgil, a Vietnam War veteran, is American, likely with European ancestry.
* Amy, the young girl who plants sunflowers, is American, likely with European ancestry.
* Marigold, the old woman who cares for the garden, is American, likely with European ancestry.
The book focuses on how these individuals, with their unique cultural backgrounds and experiences, come together to create something beautiful and meaningful through their shared passion for gardening. It highlights the importance of understanding and appreciating diversity within a community.