The Pleasure Grounds at Osterley lie north and west of the house. The best time to enjoy their flowers is June to September.

The Pleasure Grounds served as the garden in Gresham's time and during the 18th century. The large Oriental plane tree that visitors can see was planted in 1755. This species tends to grow large, low branches that brush the grass.

The Garden House, displaying many of Adam's hallmarks, includes a semi-circular frontage, stucco medallions of festive figures and Ionic pilasters. Only the sphinxes that once occupied the ends of its parapets have disappeared.

In 1782 it was known to contain 45 citrus trees, many of which were brought out in the summer months to enhance the path to the front.

Created as a peaceful and separate haven in which to stroll, sit and think, the plants of the Pleasure Gardens have always been important.

There were once extensive hot-houses in the adjacent Walled Garden, producing plants and flowers for the house. Flowers remain a central theme of Osterley's decoration, particularly in the State Bedroom. Today, volunteers grow and arrange the varied flowers that fill the house throughout the year.

The Outer Pleasure Ground Walk begins by the Temple of Pan and follows the line of the old boundary ditch. At the head of the Garden Lake you will find a brick bridge over to an island. Shrouded in trees and fenced off for safety, it was previously known as the Boat-house. Steps beneath the bridge led down to a boat which was kept to ferry the family and guests back to the house.