Thursday, 3rd June 2021 at 5:28 pm In 2017, the Royal Horticultural Society – best know for the prestigious Chelsea Flower Show – embarked on creating a showcase garden on the site of a former grand Victorian estate in Greater Manchester. Advertisement The project at RHS Bridgewater in Salford is the fifth Royal Horticultural Society garden – the other four are Harlow Carr in Yorkshire, Hyde Hall in Essex, Rosemoor in Devon and Wisley in Surrey – and their most ambitious project so far. The four episodes of The Great Northern Garden Build follow the project, going behind the scenes and meeting the team of designers, engineers and gardeners who took on this colossal construction project at RHS Bridgewater.