RCAHMW colour oblique aerial photograph of Dyffryn House and Gardens, high view of formal gardens taken 16 May 2002

The gardens of Dyffryn, a Grade 2 Registered Park and Garden, are considered the grandest and most outstanding Edwardian gardens in Wales. They are comparable to some of the most extravagant gardens of the period in Britain. They are the result of a remarkable partnership between two outstanding men of their generation - the owner and horticulturalist Reginald Cory and the landscape architect Thomas Mawson. The structure of the gardens, combining the expansively formal and the intricately intimate, survives almost in its entirety, with some later modifications within the general framework. Within the gardens are many notable trees, including some very early introductions. They date from the sixteenth-seventeenth century; late eighteenth-early nineteenth century; 1891 and 1905-31.