Jennifer Saunders and Adam Frost present a look through the history of the Chelsea Flower Show to discover the people, plants and designs that have made it the greatest flower show on earth. From its legendary designers to the judges, Chelsea Pensioners to the Queen, nurseries to veg growers, this is the definitive guide to the great event that heralds the start of the British summer. With the alphabet as their guide, Jennifer and Adam guide viewers through the highlights of over 100 years of Chelsea magic, each letter representing a significant element of this British institution. The programme features a special profile of Sarah Eberle, Chelsea's most prolific gold medallist, and there is a look back at some of the game-changing creations that transformed the event into the world leader it is today. Arit Anderson and Frances Tophill travel across the UK to meet nursery folk as they prepare to exhibit in the Great Pavilion and uncover the secrets behind their successes at the show.

Nicki Chapman and James Wong take a first look at the RHS Chelsea Flower Show 2018, which opened its gates to a host of VIP's and celebrities. Nicki chats to pop star turned farmer JB Gill about his newly found passion for gardening, and Nick Knowles looks at the Chelsea show gardens designed to raise awareness. Florist Simon Lycett arranges a vase of seasonal flowers with actress Lesley Joseph, and the team will be capturing all of the buzz of day one.