Adam Frost is in his garden, catching viewers up on his new patio project and discussing his plans for the autumn.Arit Anderson travels to Somerset to meet landscape designer Dan Pearson, to find out about the design and planting principles he has used to create his own garden. In London, film director and musician Don Letts and his wife show how they have combined their different tastes for plants and culture in their town garden.There is another chance to see Frances Tophill meeting a gardener who grows most of the vegetable ingredients needed for Thai cooking in her back garden, and the team visit two enthusiasts with a passion for air plants at their nursery in Lancashire.