Monty Don adds plants to give height and drama to his cottage garden borders, while Carol Klein's plant of the season is the delicate dog's tooth violet. Joe Swift travels to the Trellisick garden in Cornwall to meet a special garden volunteer and Adam Frost returns to Leicestershire to monitor the progress of the new-build garden.
Monty Don, Adam Frost, JJ Chalmers, Carol Klein, Joe Swift, Nick Bailey, Arit Anderson, Rachel de Thame, Frances Tophill, Toby Buckland, Sue Kent, 3 more, Advolly Richmond, Kate Bradbury, Rekha Mistry