At Longmeadow, Monty Don is making plans for the summer, so he starts dahlias and other tender perennials into growth and sows annual climbing plants to light up his borders with colour. Frances Tophill visits The Royal Botanic Garden Edinburgh to meet an expert on the most exotic plant of the tropical border, ginger. Plus the team explore one of the most colourful perennials of the summer in the Isle of Wight, visiting a garden which is filled with daylilies.