Hans Fitting

Johannes (Hans) Theodor Gustav Ernst Fitting (23 April 1877, Halle an der Saale – 6 July 1970, Köln) was a German plant physiologist. He was the son of law professor Heinrich Hermann Fitting.

He studied natural sciences at the universities of Halle and Strasbourg, receiving his doctorate in 1900 as a student of Hermann zu Solms-Laubach. After graduation, he served as an assistant to Wilhelm Pfeffer at Leipzig, then worked under Hermann Vöchting at the University of Tübingen. In 1907/08 he took a study trip to Ceylon and Java, where he conducted extensive research of orchids at the botanical research center in Buitenzorg. After returning to Germany, he became an associate professor at Strasbourg, then relocated to Halle in 1910, and soon afterwards was named director of the botanical gardens at the colonial institute in Hamburg. From 1912 onward, he was a full professor of botany at the University of Bonn.

His botanical research largely dealt with subjects such as: phototropism, cellular and developmental physiology, haptotropism, and plant physiology based on geography. While studying pollination in orchids, he was the first scientist to use the term "hormone" (Pollenhormon) in connection with plants, and in doing so, suggested that plants produced hormones.