With the growing season well and truly underway, Monty Don turns his attention to planting out his sweet peas and potting up lilies. Carol Klein returns to Gloucestershire to help first-time gardeners, Dan and Dominique, plant up their new border in the style of a cottage garden. And we meet newsreader, Sophie Raworth, to find out why plants and gardens are so important to her in the run up to the Chelsea Flower Show.