The 7ft shed, made of curving weathered steel with a wildflower meadowgrass roof, is located in the corner of Anna Guest’s garden at Inverleith Terrace near the Water of Leith pathway in Edinburgh.
Prince Charles has a similar shed at his home at Highgrove, which has an Indian theme.
Ms Guest, who commissioned the £22,000 shed with her partner Gus Schwartz from Edinburgh-based Groves-Raines Architects, said: “I’m delighted with it. When we took over the garden there were no worms, no insects, just a very, very silty soil which was not a good medium for growing things.
“That’s all changed. One of the reasons for it being designed the way it is that you can come down a tunnel in my garden and it looks like a raised garden.”
Visitors to more than 600 gardens, ranging from castle grounds to allotments, will pay a small admission fee and are served refreshments.
Ms Guest, is charging £4 to visit her three-quarter-acre Rocheid Garden, complete with olive trees and bamboo, which is open from 2-5pm on 26 May and 8 September. Money raised will be donated to the Ferryfield NHS-run care unit in Edinburgh.
She added: “Last year I had residents, staff and relatives from Ferryfield visiting my garden and gave them tea on the terrace. They loved it and the shed is that extra bit of fun. I want to use my garden in any way I can to help.”
The compost shed has won a number of awards including the chairman’s prize at the Scottish Design Awards – the country’s biggest architecture competition.
Paddy Scott, director of Scotland’s Gardens, which has operated for more than 80 years, said: “This wonderful garden has a remarkable feature in its compost shed – something quite out of the ordinary which fascinates all visitors.”
For more information go to www.scotlandsgardens.org.