This garden is only open one day a year for one afternoon as it is the artist’s own garden:

“The garden is only occasionally open to the public but, when it is, the interest among gardeners is so great that local roads have been blocked by traffic. It features large mounds of earth with paths circling around them, extensive water features and sculptures of stone, metal and wood.
Twisted, undulating landforms and terraces designed by Charles Jencks as “The Garden of Cosmic Speculation”. Lakes designed by maggie Keswick. Nonsense building, sculptures, kitchen garden of the six senses. Teas.”
http://www.gardensofscotland.org/GardenDetails.aspx?GardenID=712