Running from Monday September 14 to Sunday October 4, one of the main attractions will be a map of the world made from dahlias.
The display will commemorate the 16th International Conference of National Trusts, which is being held in Cambridge from Monday 7 to Friday 11 September.
The festival will also feature the work of Cambridge-born, contemporary artist Rebecca Louise Law, who returns to revisit the interactive installation of over 1000 dahlia heads.
Visitors will be asked to choose a dahlia of their choice and encouraged to take part in the creation of the artwork, which will meander throughout the gardens.
Creation of the Dahlia Line is set to start on WednesdaySeptember 23.
Head gardener Richard Todd, said: “The final look and colour of the Dahlia Line, will be totally dependent on our visitor’s choices.
“We’ve grown hundreds of extra dahlia plants to provide flowers for the installation”.
Members of the Garden Team will be in the Dahlia Garden each day throughout the Festival from 2 - 3.00pm, to answer questions and provide top tips on how to grow and care for dahlias at home.
The gardens are open daily 10am – 5.30pm and the house is open Wednesday – Sunday, 11am – 3pm throughout the festival.
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