Watch Love Your Garden Season 4 in Australia

New series. Alan Titchmarsh comes to the rescue of Malcolm Dean, a keen gardener who is unable to continue his hobby after being diagnosed with motor neurone disease.

Alan Titchmarsh is in Cambridge to help transform the garden of a mother whose son requires round the clock care. He has an idea for a beach-theme complete with a sound system.

Alan Titchmarsh and his team come to the aid of Carol Nwosu, who has to care for her son, Danny - who has sickle cell anaemia - while coping with her own debilitating arthritis.

Alan Titchmarsh and his team are in Gloucestershire to revamp the garden of Kathy Mason, a remarkable mother of two who has devoted her life to looking after others.

Alan Titchmarsh and the team are in London, where they transform the run-down garden of Joan Myers, a senior paediatric nurse who has worked tirelessly to help improve the way children are cared for within the NHS - but in doing so, has let her own garden become overgrown. Alan plans to give her a peaceful retreat outside her back door with flavours of Africa and the Caribbean, as well as more than a splash of purple, her favourite colour. He also reflects Joan's community spirit by challenging the team to make over three front gardens, finding different ways of revitalising these tired and forgotten spaces.

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.