To the north-east of the main house at Waterstown, County Westmeath stand the remains of what was once a very substantial walled garden, running to at least four acres. Certainly one of the largest extant examples of this horticultural form dating from the mid-18th century – although now in a very poor condition – the garden consists of a series of four ascending terraces, the outer walls constructed of rubble limestone lined internally of brick, the latter material also used for the terrace walls. Some of these have curved, or corrugated, sections (thereby offering additional shelter to tender plants) while others have infilled arches. That same device also features in the main entrance to the site, which takes the form of a brick-faced triumphal arch (with Diocletian window inserted into the pediment)  flanked by single-storey pavilions. If Waterstown was designed, as is generally the consensus, by Richard Castle then this walled garden must be attributed to him also; the entrance certainly displays just the right amount of eccentrically-used architectural motifs. Today the site is partially used as a farmyard but otherwise stands empty.