What does Sam notice about how the garden is set up in Seedfolks?

Sam is a seventy-eight-year-old Jewish man who hires a teenage Puerto Rican boy to plant pumpkins in the community garden on Gibb Street. One Saturday, Sam notices the garden is divided among certain ethnic groups, which is similar to how the neighborhood is separated into enclaves. He saw the black and white people working in separate parts of the garden, while Central American and Asian people had their plots toward the back of the lot. Sam comments that he wasn't surprised to see each group keeping to themselves, speaking their own language, and growing their own specific crops. He compares the garden on Gibb Street to the biblical Garden of Eden and mentions that the same God who made Eden also destroyed the Tower of Babel by dividing people. Sam believes the garden is turning back into Cleveland.