The German wine-growing specialist Johann Christian Metzger (1789-1852) was after a gardening apprenticeship in Karlsruhe a senior assistant in the palace garden of Schwetzingen and a senior gardener at the Margrave Ludwig in Karlsruhe, after which he worked as a plantation inspector for the Enz, Kinzig, Murg and Pfinzkreis, based in Rastatt. In 1812 Metzger was appointed university gardener to be responsible for the garden at Heidelberg Castle and in 1843 appointed garden director. In addition to other functions, he was a member of the Baden Landtag, a member of Heidelberg University and president of the fruit-growing section for the meetings of German wine and fruit-growing producers.
He dealt with numerous fruit and wine-growing topics, but also with tobacco growing. Furthermore, Metzger was a member of numerous scientific and professional societies. He published the works "Der Rheinische Weinbau" and in 1836 together with Lambert Joseph Leopold Freiherr von Babo (1790-1862) "The wine and table grapes of the German vineyards and gardens". With that he performed in the ampelography an important contribution to the determination of grape varieties. See also under Viticulture personalities,