The impressive 100 metre long pergola was designed by Harold Peto and needed extensive restoration following the 1987 storm. It is host to many varieties of magnolia, clematis, rose and honeysuckle.
Interior herbaceous borders are planted with a wide variety of hostas, pelargoniums, ferns, iris, dicentras and spring bulbs. The Gazebo at the west end of the pergola features a mosaic floor of knapped flints interspersed with horses' molars.
The amphitheatre to the north is used for theatrical open-air performances in the summer period.