Horticulturist Christine Walkden explores the Scottish Borders by hot-air balloon, and discovers the role art and literature played in creating memorable gardens. She visits Abbotsford House, the former residence of writer Walter Scott, where she tries her hand at fly-fishing, and meets a woman whose family history at the property spans a century. She then visits Little Sparta in the Pentland Hills and examines a garden poem, before learning how the Royal Botanic Garden in Edinburgh was created