A new category ‘FreeForm’, will feature "wildly imaginative, breath-taking installations with a horticultural slant".
RHS shows director Nick Mattingley said: "RHS Chatsworth Flower Show will be unique, it will literally break new grounds in horticultural expression. We aim to push the boundaries and create mind-blowing content so are reaching out to the most creative minds out there to help us realise this vision.
"The first show is themed around ‘Design Revolutionaries’ so, if you are an innovative thinker with artistic flair and want to try your chances at exhibiting at an exciting new show, check out the ‘FreeForm’ information on our website and be part of something amazing."
The ‘FreeForm’ category will not be judged for RHS medals, but will be eligible for a People’s Choice Award.
More than 80,000 visitors are expected to attend the show.