The award-winning 6 acre Victorian Walled Garden was built by Mitchell Henry at the same time as the construction of Kylemore Castle between 1867 and 1871.

The garden was one of the last walled gardens to be built during the Victorian period in Ireland and is the only Walled Garden constructed in bogland (peatland). The garden was so advanced for the time that it was compared in magnificence with Kew Gardens in London.