The study pertains to the prose of Johanna Spyri, considered on the example of a series of novels: Heidis Lehr-und Wanderjahre (1880) and Heidi kann brauchen, was es gelernt hat (1881), which in their Polish translation appeared under the common title: Lata nauki i wędrówek Heidi (1st Edtion, 1927). The paper discusses, inter alia, the origins and reception of the series about Heidi’s adventures, its connections with the nineteenth‑century mountain fiction nov­el (Bergroman) and sentimental literature for girls, the Swiss writer’s interest in mountain tourism and, finally, the theme of personal experience of high moun­tain settings and knowledge of the realities of highlanders’ life. The potential for reading Spyri’s novels in the perspective of ecopoetics is verified in the study using biographical sources (e.g. Regine Schindler, Dieter Richter, Ernst Halter), as well as sources pertaining to ecocriticism (e.g. Przemysław Czapliński, Peter Barry) and ethnography (e.g. Jacek Kolbuszewski). Impressionistic and veristic descriptions of alpine nature in Spyri’s novels intertwine with her reflection on the threats to the ecosystem posed by metropolitan civilization. A friendly attitude towards natural environment seems to be the only acceptable approach assumed by the author of the series about Heidi, while manifestations of hos­tility towards nature, even trivial (such as picking flowers by the protagonist), not to mention deliberately destructive acts, are positioned in the sphere of an­ti‑values.