Established in 1832, the 140-acre Jardin d'Essai du Hamma comprises a 94-acre botanical garden and a 49-acre arboretum. It started as marshes that were drained to create a 12-acre model farm and test garden that provided plants for multiple purposes, including commercial and medicinal. In 1900, it added a zoo, and through other acquisitions and expansions. The garden reopened to the public in 2009, 16 years after closing for renovations.
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