The Alnwick Garden
The Alnwick Garden is a complex of formal gardens adjacent to Alnwick Castle in the town of Alnwick, Northumberland, England. The gardens have a long history under the Dukes of Northumberland, but fell into disrepair; they have only been revived over the past ten years, and now feature many different themes and influences, built around a central water cascade. The final phase of development is still to come, which will include more gardens and an adventure play area.

The first garden was laid down in 1750 by the 1st Duke of Northumberland, who employed Capability Brown, the celebrated gardener, to landscape the parkland adjoining Alnwick Castle. The 3rd Duke was a plant collector, and led a century of development at Alnwick - he brought seeds from over the world, and pineapples were raised in hothouses. In the middle of the 19th century, the 4th Duke created an Italianate garden featuring a large conservatory, and at the end of the century, the gardens were at their grandest, with yew topiary, avenues of limes and acres of flowers. During World War II’s Dig For Victory campaign, the garden was turned over and provided food, and soon afterwards the austerity of the 20th century saw the garden fall into disrepair. It was closed as a working garden in 1950.

Current developments
Redevelopment of the garden was instigated by Jane Percy, the current and 12th Duchess of Northumberland in 1997, and is being created by Belgian landscape designers Jacques and Peter Wirtz. It is the most ambitious new garden created in the United Kingdom since the Second World War, with a reported total development cost of £42 million. The first phase of development, opened in October 2001, involved the creation of the cascade and initial planting of the gardens. In 2004 a large 6,000 sq ft (560 m2) 'tree house' complex, including a cafe, was opened. It is one of the largest treehouses in the world. By that year it was the third most visited paid entry garden in the UK (after Kew Gardens and Wisley), with over half a million visitors. In February 2005, a poison garden, growing plants such as cannabis and opium poppy, was added. May 2006 saw the opening of a pavilion and visitor centre, designed by Sir Michael Hopkins and Buro Happold, which can hold up to 1,000 people. The pavilion and visitor centre feature a barrel-vaulted gridshell roof. The garden now belongs to a charitable trust, which is separate from Northumberland Estates, although the Duke of Northumberland donated the 42-acre (17 ha) site and contributed £9 million towards the development costs.