A member of the hippie movement or counterculture, who typically advocated love, peace, and nonviolence: a caricature of a London flower child who is about as interesting as a boiled potato/ Woodstock is long over, and the bloom has gone off these flower children/ the flower people of the late 1960s, mostly middle-class kids trying to create a gaudy secular religion (1960s+)
[plural is flower children or flower people]