Monty Don supports Thrive, a charity promoting gardening to disabled people.
Thrive approached Gardeners' World presenter Monty Don five years ago after he took part in a radio interview about his long history of depression and Seasonal Affective Disorder.
Nicola Carruthers, chief executive of Thrive, says: "Monty talked about how gardening had helped him deal with his depression, so we knew he would have a lot of sympathy with the people we work with."
Don recorded an appeal for Thrive for BBC1's Lifeline appeal, aired on 15 September. He also acts as a guest speaker, writes articles for the charity and helps judge competitions. "Monty came back early from his holiday just to record the Lifeline appeal," says Carruthers. "I'm very careful to ask him to do only one big thing for us a year. Monty was one of the first celebrities to talk about his mental illness and his experience enables him to understand what we do."
Don says: "I have a personal interest in the therapeutic benefits of gardening and I know it can help many people."