In the trellis-filled garden, a patchwork of small lots that are passed from family to family, they find friends, a routine for daily life in new surroundings and familiar vegetables that are fresher than anything they find in local markets.
"The sun is shining. I'm sweating. It's good," said 63-year-old Zhang Zaixian, of Beijing, who was watering chives one day as her grandson attended preschool. "I am happy."
The urban garden began taking shape a decade ago, a product of the expatriate community that has sprouted along with soaring numbers of students from China.
About a quarter of all international students at Yale come from China, which has become the biggest source country by far for international students in the United States. Yale, which in 1854 graduated the first Chinese person to earn a degree from a U.S. college, had 680 international scholars, 516 graduate students and 58 undergraduates from China last year.
The gardeners come from a mix of urban and rural areas and abide by a few unwritten rules. Fertilizer is allowed, but pesticides are forbidden. Remove watering cans and clean up in the fall. Find another family to work your patch when you leave New Haven.
Zhang, whose daughter earned a Ph.D. in China before coming to do research at the Yale School of Medicine, said she had never done any gardening at home in China's capital, where she had a career keeping statistics for industry and the navy. Zhang's health had been waning before she first came to Connecticut, in 2009, but she said tending to plants each day under smog-free skies has made her feel renewed.
The garden succeeds, she said, because the gardeners belong to an older generation that has patience.
"Young people don't want to do the labour," she said.
All the plants are edible. They include varieties of beans, scallions, tomatoes and cilantro that they eat or use to season dumplings and other dishes.
The produce, grown from seeds found in New York City's Chinatown and some local Asian markets, is shared with other Chinese families that live in the complex of two-story apartment buildings across the street from the garden — even if they choose not to do gardening themselves.
"I wasn't farming anymore in China. Why should I do farming here?" said Wang Lunji, 65, from Anhui province in eastern China, where the land he once worked was plowed under for development. Wang, whose son studies biology at Yale, said he nevertheless appreciates the vegetables shared by his neighbours.
Yale owns the land, which had been overgrown before a few families started the planting, and Yale grounds crews have provided compost to help the gardeners. The only issues, they say, have been occasional theft or vandalism.
In at least some cases, gardeners have suspected each other when plants have gone missing. Veteran gardener Guo Zhirong said one plant that disappeared would not have appealed to Americans.
"Some people are from cities and don't know how to grow plants," he said. "Maybe they just said, 'Wow, so beautiful,' and they took it away."
Guo, 71, was a farmer himself in Sichuan province and has taught many, including Zhang, how to water, fertilize and harvest the plants.
"It's easy. They just watch and learn," he said. "Some are not doing excellent, but they are doing OK."