|This article does not cite any references or sources. (June 2010)|
 History of Trebah
In 1831 Trebah was acquired by the Fox family who built Glendurgan Garden. Trebah was first laid out as a pleasure garden by Charles Fox, a Quaker polymath of enormous creative energy who paid meticulous attention to the exact positioning of every tree. His son-in-law, Edmund Backhouse, M.P. for Darlington, took the work further.
 The Hexts
In 1907 Trebah was bought by Charles Hawkins Hext and inherited on his death in 1917 by his wife, Alice, who died in 1939. From 1939 to 1981 the garden fell into decline, since the substantial Trebah Estate was sold off in small packages, of which the house and garden was one.
 World War II and after
One of the subsequent owners was Donald Healey, the motor car designer, who removed some of the concrete military structures and provided a boathouse on the beach.
 Development of the garden by the Hibberts
Indeed, when Major Hibbert agreed to three years, little did he know it would become a quarter century. This decision, influenced in part by a bottle of gin, "has given us the happiest twenty-four years of our lives and had we not taken up the challenge."
 The Trust
The garden was opened to the public in 1987 and by 1989 visitor numbers had reached 36,000. The Hibbert family then gave the house, garden and cottages to the Trebah Garden Trust, a registered charity, to ensure that the garden could be preserved for future generations.
In 2000 visitor numbers had exceeded 105,000 and a £1.94 million grant from the Heritage Lottery Fund and Objective One allowed Trebah to build the new 'Hibbert Centre', to rebuild Alice Hext's seat, restore the nursery and carry out major landscaping and garden improvements.