The Alter Botanischer Garten Hamburg (Old Botanical Garden Hamburg), sometimes also known as the Schaugewächshaus or the Tropengewächshäuser, is a botanical garden now consisting primarily of greenhouses in the Planten un Blomen park of Hamburg. Alter Botanischer Garten is located on the Hamburg Wallring at Stephansplatz and is open daily without charge.The garden is located on the site of Hamburg's old botanical garden at the city wall, established 1821 by Professor Johann Georg Christian Lehmann (1792–1860). Its alpine garden was established in 1903; most plants were subsequently moved to the new Botanischer Garten Hamburg in 1979. Herbal and medicinal plantings are clustered around the city's former moat. Today's gardens consist primarily of five interconnected greenhouses, total area 2,800 m², built 1962–1963 by architect Bernhard Hermkes (1903–1995),