Walled Garden, Arniston House

This is a walled garden dating to around 1764. It has a near-rectangular shape and is constructed of random sandstone rubble with rubble coping along the south side, and flat coping elsewhere. Lean-to potting sheds made of brick and rubble are attached to the exterior of the north wall. Greenhouses are situated within the north wall; much of the glass is missing from the greenhouse on the west side, while the glass of the east greenhouse has been replaced with corrugated plastic.

A round-arched gateway, flanked by greenhouses on the east side, is accessed via an early 20th-century decorative iron gate. The exterior elevation of the gateway features a stugged ashlar lintel topped with a carved thistle datestone reading "1612". On the interior elevation, five vertically arranged nail head stones are surmounted by carved Doric pilaster capitals, with fluted and reeded pilaster tops, flanked by carved strapwork panels, supporting carved masks of an elephant and a lion, and stone urns. A carved strapwork lintel with a central fleur-de-lys is surmounted by an auricular mask.

A gateway to the west of the north wall has an early 19th-century ironwork gate bearing the initials "RDMS," and a bowed lintel with geometrically carved corner stones. The central gateway on the west wall has an early 20th-century ironwork gate and features broached, square-plan, coped gatepiers with spherical finials. A gateway to the south of the west wall is fitted with a boarded timber gate and droved, coped, square plan gatepiers. The north gateway on the east wall has an early 19th-century elaborate ironwork gate, featuring "ED" (Elizabeth Dundas) surmounted by fleur-de-lys, with gatepiers that sweep down from the walls and step out at the base, incorporating long and short dressings, topped with rectangular plinths that originally supported stone urns. A marble plaque dated 1916 commemorates Colin MacTaggart on the exterior.

Rubble potting sheds are located to the east of the interior south wall, featuring a boarded timber door and irregular fenestration on a flat-roofed shed to the left; the shed to the right is blank, and both are flanked by a timber shelter. Two 20th-century glasshouses span the area opposite the potting sheds and have brick walls.

A polished sandstone loggia, dating to the early 19th century, is situated within the interior of the northeast corner of the walled garden. It is supported by four Doric columns and an entablature, with a central segmental pediment enclosing a royal cipher and flanked by carved masks. Carved panels on the interior feature two thistles and one rose.