Fresh from unprecedented success at last month's event, the Landform Consultants managing director told HW he was tired but already looking forward to next year's show.
Gregory said: "I have a few ideas but the one we already have sorted is a government funded garden building for Jim Fogarty and Melbourne Botanic Garden, the first Australian government-funded design ever at the show. I'm excited about it and I am working on a few ideas but I don't think I will ever emulate this year. The medals were one thing but we managed to help a lot of people so we had a lot of fun this year."
The Australian Garden will emulate the interpretive story told at the Royal Botanic Gardens Cranbourne - The Journey of Water.
Designed by landscape designer Jim Fogarty, it will start by depicting the arid outback of Australia, gradually moving through more luscious wetter landscapes, symbolising the urban east coast.
Water will well up from an inland mound spring, tumble down a cliff and flow to the home gardens of the populous coastline.
More than 3,000 shrubs and trees have already been selected.
They will be sourced from several areas across Europe and grown by show growers across the country.
A box of rare and threatened seed is being shipped from RGB Melbourne to the UK where they will be grown for the garden.
The seeds were collected as part of the Victorian Conservation Seedbank, an international partnership with the Millennium Seed Bank Project, led by RGB Kew.
Many Australian plants featured in the garden have never been seen at the show before.