TU Delft botanical garden dates back to 1917, where Proof Garden for Technical Plantation ( Dutch : Cultuurtuin voor Technische Gewassen ) was established  by Gerrit van Iterson Jr., TU Delft graduate and assistant to Martinus Beijerinck .  Gerrit van Iterson Jr. was the first director of the garden until 1948. Creation of botanical gardens at TU Delft was partially a result of the increasing needs of systematized development of tropical agriculture in then Dutch colony of Dutch East Indies .  Over 7000 different species of plants, including tropical and subtropical plants, herbs , and ornamental plants cover the area of almost ha.  Furthermore, more than 2000 unique species are preserved in university's greenhouses . All facilities of TU Delft botanical garden are open to the public.