As a young boy in 1960s Plymouth, Allan Jenkins and his brother, Christopher, were rescued from their care home, fostered by an elderly couple. There, the brothers started to grow flowers in their riverside cottage. They found a new life with their new mum and dad.
Yet as he grows older, Allan feels unsatisfied with the unanswered questions about his past. His foster parents were never quite able to provide the family the brothers needed, but the solace he finds in tending a small London allotment echoes the childhood moments when he grew nasturtiums from seed.
Over the course of a year, Allan digs deeper in to his past, seeking to learn more about his absent parents.