The feature takes cues from the landscape style developed by Capability Brown, with 1.5m metre high green rolling hills being at the heart of the design.
Rolawn sales and marketing director Jonathan Hill said: "Natural grass has been at the heart of UK gardens and landscapes for centuries, we are delighted to be working alongside the North of England Horticultural Society in celebrating this fact."
Smith said Capability Brown's legacy "for most people, there’s very little relevance – other than a nice day out in a country park. However, what does remain are Brown’s principles of design, proportion, scale and, with a bit of thought and imagination, we can play around with these elements. At the show, we created a mini landscape within a giant black fence, accessed by large golden gates – we’re making a virtue out of necessity".
He added: "My next project is for Rolawn at RHS Hampton Court Flower Show and it’s a conceptual garden entitled ‘Why?’. At its heart, the concept behind it is to constantly ask questions. In my opinion, the things we do know are quite boring – what we don’t know is where the interesting stuff is found.
"The garden is very strong, visually striking and forces the eye up into the light and down into the darkness. It’s also quite ‘out there’ and is a bit different to the traditional gardens that can be found at flower shows. You have been warned."