Urban Oasis is being billed by the organiser as a central feature at the show and aims to highlight the power of community gardening in brightening up Britain.
The RHS and environmental charity Groundwork are also using the design to call on the nation to take action and make a difference to their neighbourhoods.
"Urban Oasis is a vast 1,600sq m representation of the ways neglected public spaces can be transformed into beautiful and productive community havens," said the RHS.
Around 600 gardens, plant displays and stands are spread over 14ha of parkland at Hampton Court Palace parklands in Hampton Wick, Surrey between 3 and 8 July.
Today, 2 July, is a press and preview day for the show and this is the first time RHS and Groundwork have united for the show
The Urban Oasis garden, sponsored by M&S, was inspired by Groundwork and RHS It’s Your Neighbourhood projects that Chris Beardshaw visited across the country.
It includes mature trees from Majestic Trees and garden features such as a derelict space, gated alleyway, allotment, community garden and orchard.