Arboretum

The arboretum (or botanical garden) is a garden that has been incorporated into several Federation starship classes in the 23rd and 24th centuries including the Constitution-class and Galaxy-class.

As well as being an area where crewmembers can relax in their off duty hours, the arboretum's true purpose is part of the science department aboard a starship, where botanists can experiment with various forms of plant life. (TOS episodes: "The Man Trap", "And the Children Shall Lead", and "Is There In Truth No Beauty?"; TNG episodes: "Dark Page" & "Night Terrors").

When new personnel were assigned to the USS Enterprise in the 2260s, the arboretum was one of the locations that they were given a tour of by their section leader. When Kell toured the arboretum in the guise of Jon Anderson in 2266, he was amazed that Starfleet would give so much space over to scientific research and plant life, when compared to the layout of Klingon warships. (TOS novel: Errand of Vengeance: The Edge of the Sword).