Francé-Harrar created the scientific basis for the humus - compost economy together with her second husband Raoul Heinrich Francé. During her life she wrote 47 books, some 5000 articles in the German press and held over 500 lectures and courses, including in radio broadcasts.
Already at a young age she combined heir artistic and literary talent with technical research. The first printed work appeared in 1911 and described in verses the lifes of women over the centuries. In the same year she married first, but after only six years this marriage has been cancelled. 1916 she met Raoul H. Francé, director of the Biological Institute in Munich, and became his assistant. 1920 the first utopian novel The fire souls described the problem of the destruction of soil fertility. After the divorce from her first husband, she married Francé in Dinkelsbühl 1923. In 1924 the couple settled down in Salzburg. There she wrote - based on impressions and research - a book about the famous doctor Paracelsus, who had died in this city 1541. The period to 1930 was the first group of overseas travel, the occasion for a series of monographs. With regard to the health of her husband, increasingly frequent stays in Ragusa (today's Dubrovnik) on the southern Adriatic coast followed. From there the couple fled in the turmoil of the Second World War to Budapest 1943, where Raoul Heinrich Francé died in the same year - a leukemia had been recognized too late. After the end of the Second World War Annie Francé-Harrar already began with the construction of a breeding station for the transformation of urban waste in Budapest in the summer of 1945 and developed the first Impfziegel for composting.
1947 she returned to Austria. At the Bavarian Agriculture Publishers her work appeared in 1950 with the titel The Last Chance - for a future without emergency, of which popularity was high. Even Albert Einstein admired this work and said it will become a permanent place in the world literature. Due to their book The Last Chance she was appointed on behalf of the government in Mexico and supported the country for nine years to set up a large humus organization in the fight against erosion and soil degradation. As a result of almost 40 years of work finally in 1958 the book humus - soil life and fertility was published. After several intermediate stops in Europe she returned in 1961 at their home. She worked still active in the World Union for Protection of Life and other organizations. She spent her last years in the pension Schloss Kahlsberg, where she died in January 1971 after a short illness in 85th years of age. On 26 January she was buried on the side of her husband in Oberalm-Hallein.