Dating from the 18th century, The Walled Garden at Glenarm Castle, the ancestral home of the Earls of Antrim, is one of Ireland's oldest walled gardens. Since opening to the public in 2005, the restoration of The Walled Garden has continued under the stewardship of
Nigel Marshall, formerly Head Gardener at Mount Stewart
. There are herbaceous borders, a rose border, mound and water features.