The Secret Garden

Anime Himitsu no Hanazono is an anime television series aired in Japan from 1991 to 1992. It is an adaptation of the 1911 novel The Secret Garden by Frances Hodgson Burnett.

Plot
A girl named Mary moved to her uncle's mansion because of her mother and father's died. She explores a secret garden with the help of her bluebird friend. She decides to make it her place.

Other Sources
https://en.wikipedia.org/wiki/Anime_Himitsu_no_Hanazono https://en.wikipedia.org/wiki/Himitsu_no_Hanazono