“We’ve made every effort to be sustainable,” says Shelagh Fritz, Program Manager of Alcatraz Gardens. Scraps and cuttings are collected for compost, never hauled away. Over on the other side of the island, near the rose garden, she proudly shows me Alcatraz’s award-winning compost, lifting up a tarp to reveal a shoulder-high collection of steaming organic matter, complete with plump, writhing worms.