Greatest Gardens with Diarmuid Gavin and Carol Klein

The wait is over: the search for Northern Ireland's greatest garden is almost at an end. Five passionate gardeners have reached the final. After an early autumn road trip spent revisiting these five truly incredible gardens to refresh their memories and see how the gardens are faring, Carol and Diarmuid join the finalists, their families and friends at Greenmount's walled garden in County Antrim to reveal which one of the five will be named Greatest Garden.