Andrew Fisher Tomlin and Tom Harfleet have nearly completed the first British-designed show garden at the first Australian Garden Show Sydney.
But the pair have gone native with their design September Sky for the show which opens this week.
Show curator Myles Baldwin, a well known Australian designer, challenged them to only use Australian natives in their garden.
He said "It has been great to get a different perspective on Australian gardens from designers who are known for anything other than the Sydney aesthetic. Their use of native plants comes from a different perspective so I am sure visitors will be able to take some new design ideas home."
Fisher Tomlin, who is also an ambassador for the new show, said the challenge was using a new planting palette while also being convincing with their uses.
"As we finish planting the garden I'm delighted that so many people have already given me the thumbs up and have said that it feels truly authentic."
He added "It has been interesting selecting plants as many of the plantspeople we have met have been surprised that we have been able to take what are relatively common plants and elevate them to show garden status."
Harfleet said the pair wanted to fully embrace the host country and its design style.
"It would be easy to come all this way and do an English garden with regional plants but we didn't want to do the expected and so far it appears we might have pulled it off."
The Australian Garden Show Sydney is supported by Destination New South Wales Other designers exhibiting gardens include Brendan Moar, Charlie Albone and Jim Fogarty.
The winners will be announced on Wednesday (5 September) the first show day. It runs until 8 September.