Twelve community gardens dot the Melrose neighborhood in the Bronx. They stand in the shadows of high rises. Each has a specialty, and its own loyal members. The jardin de la roca, or Rock Garden, at the corner of East 160th and Elton streets is known for its domino tournaments and the geology that gives it its name. Reporter Mike Elsen-Rooney takes us there, and speaks to the people who give it life.