The sixth show (30 July to 2 August) will feature 60 specialist nurseries and garden trade stands, with the chance for visitors to see mini show gardens.
Exhibitors include 17 nurseries that exhibited at last month's RHS Chelsea Flower Show. Derbyshire Bonsai, which offers outdoor and indoor bonsai trees, and WS Warmehoven, which specialises in amaryllis and alliums, are both coming to Hyde Hall for the first time and are among the nine gold-medal winners attending the show.
Battlesbridge Mills Garden Centre, which specialises in chillies and herbs including banana mint and creeping red thyme, and Dalefoot Composts, which sels composts made from ingredients such as sheep’s wool and bracken, are exhibiting.
Head of site Ian Le Gros said: "We are delighted that visitor numbers have grown so rapidly over the years, and we want to build even more on this success in 2015. With a new floral art marquee and more than 16 new exhibitors and trade stands, it will be a fresh, colourful and enjoyable event that we hope will attract people from far and wide."
This is also the first RHS Flower Show for new garden curator Robert Brett, who began working for the RHS in April and was at the Royal Botanic Gardens, Kew, at the Eden Project and at Cambridge University Botanic Garden.