Monty starts a new project - a cutting garden - and gives advice on what to grow to provide plenty of cut flowers for gorgeous summer bouquets. We visit Cumbria to meet Jack Gott, who has been passionate about that most flamboyant of flowers, the dahlia, for more than 40 years and has over a thousand plants in his garden. James Alexander-Sinclair celebrates a harbinger of spring, the ephemeral cherry blossom, at Alnwick Castle in Northumberland.