In 1840, The gardens became a national botanic garden, and Kew Gardens became a center for scientific research and the international exchange of plant specimens. Since the gardens became a national botanic garden, the name was changed from 'The Royal Botanic Gardens of Kew' to 'Kew Gardens.' Under Kew’s director, William Hooker, the gardens were increased, and by the early 20th century the grounds were expanded to the present size of 300 acres.
