This garden, which opened in 1998, was designed by world renowned English landscape architect John Brookes. It creates a feeling of "a light country garden, more relaxed than most American gardens." Its plants are typical to English Gardens, although they have been especially selected to thrive in southwest Idaho's climate.

The wall of the Old Idaho State Penitentiary, which serves as this garden’s distant backdrop, helps define the style of an English Garden, where large groupings of perennials provide seasonal interest year round. More than 1,300 perennials have been planted in this garden, as have thousands of bulbs.

A key focal point of the Muriel and Diana Kirk English Garden is the charming Summer House, constructed of Tablerock sandstone. The black slate roof originally graced the Veterans Home, and the ceiling is wood from the floor of the J.C. Penney store. The crowning achievement is the wrought iron and copper weathervane, crafted by Boise’s own master blacksmith Nahum Hersom. Another focal point is the Princess Diana Fountain, dedicated in 1998 in memory of Diana, Princess of Wales.