Alan Titchmarsh and the team create a garden for a family with twin girls who have a serious, life-limiting condition. Three-year-olds Darcie and Evie Chapman have been diagnosed with Dravet syndrome, a very rare form of epilepsy, and parents Mark and Natalie must be on permanent watch to prevent their daughters' seizures leading to something more serious. The Chapmans' current outdoor space is unsuitable for the girls, with changes of levels, colours of plants and even the light through branches influencing their condition, so the crew follows the rules of a formal garden where straight lines, order and symmetry give an unfussy overall look.

The team comes to the aid of Luke Simpson, who lost his leg in an explosion while deployed in Afghanistan. Rebuilding his life and health with the support of his wife Jackie, the war hero has struggled to make progress on the garden of his dreams. As Alan and the crew work their magic, Frances Tophill reveals the key design elements for a cottage-style plot, Katie Rushworth demonstrates how to make the most out of cut flowers and David Domoney provides hints and tips on maintaining the perfect lawn.