We describe The Talking Plants, an accessible, intuitive and enjoyable interactive system for learning about plants: how to care for and prepare them, their medicinal and health qualities, and their histories. It was developed at Spitalfields City Farm, a community farm in inner east London. Visitors can approach the plants and use a watering-can augmented with RFID technology to hear them talk. The plant voices come from staff and volunteers, reflecting the diversity of the farm. The Talking Plants was developed as part of a wider research project that looks at sustainable HCI within the context of grassroots urban food-growing communities.