Chelsea Flower Show: Monty Don takes a look round a North American-themed show garden and learns about the native plants grown especially for Chelsea. Carol Klein examines exotic specimens used for structure in a border, Joe Swift meets a tropical-plant grower with a passion for Rod Stewart, and Rachel de Thame reveals the winner of the Plant of the Year award.
Alan Titchmarsh, Charlie Dimmock, Laurence Llewelyn-Bowen, Nicki Chapman, Rachel de Thame
Documentary
