Architectural Features
Haddington House, listed A, is a 17th century building that stands on Sidegate and forms part of the western boundary of the site. The garden walls and gatepiers of the entrances to the garden from both Lady Kitty's Garden and St Mary's Church are listed B. The Apple House, listed B, is incorporated into the north wall of the garden. It dates from the 17th century or early 18th century and was formerly a two-storey building with a pigeon loft incorporated into the upper storey. The building was restored by the Hamilton family in 1975 as a memorial to the late Duke, at which time the top storey of the building was removed.
The Gardens
A series of small gardens and features are incorporated within the garden walls. The Sunk Garden is situated where there was formerly a car park, adjacent to the east side of Haddington House, and is laid out as a knot garden. The box-edged compartments enclose a variety of low-lying species which were introduced by the 17th century including Santolina neapolitan, Chamaecyparissus, Primula, Auricula, Rembrandt tulips and several varieties of sedge. On the sloping banks bordering the sunken garden, plants also introduced in the 17th century are well established, among them Hypericum calycinum, Teucrium chamaedrys and Saponaria officinalis 'Flore plena'. From this garden, a footpath leads along the north wall which is clothed with, amongst others, Ficus carica (introduced 1636). Between the path and the wall, roses and a wide range of herbs are grown in raised beds. Seats and picnic tables are situated in recesses between the raised beds. The path leads to the Apple House, midway along the north wall, opposite which lies the Cottage Garden, enclosed by fragrant shrub roses. A gap in the rose hedge on the south side of the Cottage Garden leads to the Orchard where a few fruit trees which predated the present garden remain, interplanted with other varieties introduced in the 17th century. Her Majesty the Queen and Her Majesty the Queen Mother have planted specimen trees here. The east side of the Orchard is retained by a low wall, beyond which lies the Meadow Garden. Here, a variety of spring flowers and bulbs have been planted amongst the grass. At the south end of the meadow is the Mount, a raised conical feature which was typical of the 17th century period of garden design. A pathway spirals up the Mount to a viewpoint at the top from where a view is gained of the whole garden and townscape. Opposite the Mount, along the south side of the orchard is the Pleached Alley. It is formed of laburnum trees (Laburnum alpinum, introduced 1629), trained over arches forming a shady walk to St Mary's Gate at the entrance to the churchyard. At the west end of the Pleached Alley, the path turns north along the Hornbeam Avenue which returns to the Sunk Garden.