Frances Hodgson Burnett is well-known for two other children's novels, A Little Princess and Little Lord Fauntleroy, which deal with related themes of class, compassion towards others, and childhood.
The novel The Secret Garden has been adapted into both a 1949 and a 1993 film of the same name. A musical adaptation of the novel premiered on Broadway in 1991 and ran for 709 performances. A third film adaptation is scheduled to come out in 2020.
Consider the 2016 Return to the Secret Garden, a sequel by Holly Webb. Consider Anne of Green Gables by L.M. Montgomery, which also tells the story of an orphan discovering friendship and natural beauty in a new home.