Their garden, Naturalistic took the silver medal at Gardeners World Live following a silver gilt at The RHS Show at Cardiff, where it was also named best in show.
Vital Earth supplied product for the build of Naturalistic, which featured among natural stone walls, rugged oak benches, stepping stones, silver birch trees and a carpet of natural planting.
Harry Rich (24), who runs the design and build landscapers, Rich Landscapers with his 21 year old brother David, said: "As the name, Naturalistic implies we like to create secluded individual spaces in tune with nature and Vital Earth products fit our specification for natural, wholesome products that work well in practice."
Vital Earth sales and marketing manager Maryanne Stokes said:
"We are thrilled at the success of Naturalistic and as always pleased to be supporting winners who also support our brand values."
Rich Landscapes has set its sights on developing a Chelsea show garden for 2013.