The Great Gardening Challenge

Nicki Chapman and Diarmuid Gavin welcome professional gardening teams from opposite ends of the UK. They are challenged to create amazing spaces in just two days, on a budget of £5,000, for the Care for Veterans home in Worthing, a specialist care home for elderly and disabled military vets. With a brief that includes making sure the gardens are wheelchair-friendly and low maintenance, the teams come up with very different designs.

Nicki Chapman and Diarmuid Gavin host the last of the heats, in which two pairs of horticultural designers are challenged to create a garden for Focus Birmingham Day Care Centre, an establishment which offers support and activities for people with severe physical and visual disabilities. The episode pits two recent garden design graduates who have never collaborated on a project before against a team with years of experience and the awards to show for it, who each have a budget of £5000 to create something spectacular.

Nicki Chapman and Diarmuid Gavin host the semi-finals of the horticultural challenge, with the winning teams from the previous four episodes returning to create gardens at the Glenfield Hospital in Leicester. The four teams are given two challenges - to create one garden for the staff of the hospital and another for the patients.

The competition reaches its climax with just two pairs of professional garden designers remaining, competing for the crown in the final. They are tasked to create show gardens at one of the world's greatest gardens, RHS Garden Wisley in Surrey, for a budget of £10,000. With a brief set by the garden's curator, they need to take their designs to the next level if they want to win. They have only 48 hours to complete them, and adding to the pressure, the weather is also against them.