Arboretum

The arboretum is a botanic garden found onboard several starship classes, including the Constitution and Galaxy classes. (TOS: "The Man Trap", "And the Children Shall Lead", "Is There in Truth No Beauty?"; TNG: "Data's Day")

Although the arboretum is considered a recreation area where crewmembers can relax in a natural setting, it is also an area of scientific research. (TNG: "Dark Page", "Night Terrors")

Aboard the USS Enterprise-D, the arboretum was on Deck 17, section 21 alpha. It contained a number of different types of plant life, including Cyprion cactus and roses. There was also a small pond. (TNG: "Genesis", "Dark Page")

Aboard the USS Cantabrian (NCC-24705), the arboretum was located on Deck 14. Captain Noel Turner, an avid gardener, cordoned off a section of the arboretum for his own personal use, calling the space the Captain's Private Arboretum. In this space, he grew dahlias and other flowers, as well as manuka, pohutakawa and other New Zealand natives. His private arboretum was located on Deck 14, Room 1827. (TCE: "Catalyst, Part One")

Civilians were allowed to staff positions in the arboretum. Keiko O'Brien was head of the plant biology lab while she was aboard the ship. (TNG: "Night Terrors") Children such as Clara Sutter were also allowed to help with small projects in the arboretum. (TNG: "Imaginary Friend")

In 2370, the Enterprise arboretum took the place of Lake El-Nar in Lwaxana Troi's mental recreation of the death of her daughter, Kestra, witnessed telepathically by Deanna Troi. (TNG: "Dark Page")

When the entire ship was affected by Barclay's Protomorphosis Syndrome, many of the crew were clustered in the arboretum. (TNG: "Genesis")