Horticulture was the science or practice of plant cultivation, and included elements of both botany and agriculture. The area of horticulture that focused on flower breeding and cultivation was known as floriculture.
Tuvok developed expertise in horticulture, prior to becoming stranded in the Delta Quadrant, and was previously a breeder of prize Vulcan orchids. It was because of this background that he was able to correctly identify a rare variety of Earth Cypripedium, of the Asiatic genus Paphiopedilum, found on the Sky Spirit's homeworld in the Delta Quadrant.
Tuvok shared his floricultural interests with Lon Suder during a mind meld. As a result, Suder took his newfound interest in the science and made it his own by developing what he named the "Tuvok orchid". (VOY: "Meld", "Basics, Part I")