Shortly after the family took residence in 1917, landscape designers Harries & Hall were engaged to design a fitting setting for the mansion. This was achieved by linking each principal room of the house to a terrace or garden area just outside and finally out into the beautiful wooded park. The site was further refined during the early 1920s by H.B. and L.A. Dunington-Grubb. The husband and wife design team created spectacular outdoor “garden rooms” including the Italian Garden, Sundial Garden, Summer House and the Sunken Garden. They also refined the South Terrace and designed the intricate lattice fencing for the tennis court and Italian Garden. The Dunington-Grubbs were influential in the development of their profession, were the founding members of the Society of Landscape Architects as well as Sheridan Nurseries. Sheridan Nurseries is still thriving today and remain generous supporters of the Parkwood Foundation.