In May 1849 he joined the staff at Chatsworth House, country seat of the Duke of Devonshire, boasting a famous garden of great splendour, with elaborate water works, a giant fountain, an enormous conservatory and an important collection of orchids and other botanical treasures.
Three of the seedlings were donated to Chatsworth, Syon House and Regent's Park, and competition was intense for the honour of coaxing from this waterlily the first blossom in Europe.
In the spring of 1851 Ortgies was transferred to the office and placed in charge of German and English correspondence, and the compiling of catalogues, while carrying on with supervising the aquatic and orchid cultures.
During this period Ortgies made business trips to England, Germany, Denmark and other European countries, creating a large circle of acquaintances and friends.
His predecessor in Zurich had been the energetic Eduard August von Regel, who took up the respected position of director of the Imperial Botanic Garden in St. Petersburg.
This project caused seemingly endless problems for Ortgies, though it brought financial security to the Garden, an enormous diversity of plants, especially orchids, and a greatly enhanced reputation in and outside Switzerland.
His part in Roezl's success led to his being approached by the collector Gustav Wallis whose contracts with Jean Linden and Veitch Nurseries had been terminated.