vegetation

(noun) all the plant life in a particular region or period. Synonyms: flora, botany. Examples: "Pleistocene vegetation." "The flora of southern california." "The botany of china."

(noun) the process of growth in plants.

(noun) an abnormal growth or excrescence (especially a warty excrescence on the valves of the heart).

(noun) inactivity that is passive and monotonous, comparable to the inactivity of plant life. Example: "Their holiday was spent in sleep and vegetation."