The 7th and 8th Dukes (1808–1891 and 1893–1908, respectively) made few changes, tending to maintain rather than develop the garden. The 6th Duke had created something extraordinary, but at immense cost, and so the subsequent Dukes were left to pay his debts.

The two world wars of the early 20th century had a drastic effect on the garden. The 9th (1868–1939) and 10th (1895–1950) Dukes both witnessed deterioration in the garden as men joined up to fight and coal became rationed. One of the most obvious casualties in the garden during this period of austerity was the Great Conservatory. The costs of maintenance and restoration of this glasshouse were considered too high and it had to be destroyed.

The 11th Duke (1920–2004) and Duchess were both keen gardeners and oversaw a revival in its fortunes. This has continued with the 12th Duke (b.1944). Many of the historic features have been restored and, in the last 60 years, numerous important new features have been added. 

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