The Captain's arboretum was a restricted-access area off the main arboretum on a starship.
Aboard the USS Cantabrian, Captain Noah Wrightson requested a Captain's arboretum be installed so he could grow dahlias, as well as native New Zealand plants such as manuka and Pōhutukawa.
The Captain's arboretum on the Cantabrian was located on Deck 14, Room 1827. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")