Garden of Cosmic Speculation

Designations
Official nameThe Garden of Cosmic Speculation (Portrack)
Designated21 September 2025
Reference no.GDL00417

The Garden of Cosmic Speculation is a 30 acre (12 hectare) sculpture garden created by landscape architect and theorist Charles Jencks and his wife, Maggie Keswick Jencks, on Maggie's land and their home together, Portrack House, in Dumfriesshire, Scotland. Like much of Jencks' work, the garden is inspired by modern cosmology.