The present study analyzes the work carried out by the Franco-Swiss artist Eugène Grasset from the mid-nineteenth century until the beginning of the 20th century. The first issue is to recover its main contributions in terms of its artistic production, as well as the methods of ornamental and decorative composition. From his writings: La Plante et ses Applications Ornementales (1896-1897), Méthode de Composition Ornementale (1905) and Composition Végétale (1911-1912), the treatment he gives to plants and nature within his expanded production. In fact, it created a clear precedent in Art Nouveau in France. The second issue is devoted to floral identification, taking as a starting point his work La Plante et ses Applications Ornementales with other books of nineteenth-century botanical representations necessary to carry out this task. The aforementioned work is linked to three of its most famous calendars: Au Bon Marché (1886), La Belle Jardinière (1896) and Zodiaque (1913). Finally, the results obtained are related to the language of flowers in the 19th century in France and England.
