Passage 1: The Community Garden Residents of a crowded neighbourhood turned an unused plot into a community garden. Families volunteered on weekends, while a nearby school supplied compost made from its kitchen waste. The garden produced vegetables, but its greatest value was social. People who had rarely spoken began exchanging seeds, recipes and advice. The organisers later added a shaded bench so that older residents could participate without doing heavy work. Question: What is the main idea of the passage?