A sconce is a light fixture that’s attached to a wall.
A planter is large pot or other container that holds . . . a plant.
Which begs the question: “what do you call a planter mounted on a wall?” (pictured above).
My term, at least: “a planter sconce.” 🙂
P.S.: Two other candidates, courtesy of Alan Crystal: “plonce” or “scanter.”
See also, “Flatwork,” Defined“; “Plural of ‘Stir-Fry’?”; ““Non-Traditional” vs. “Regular” Sales“; and “Watching the Oscars . . . But Skipping the Commercials.”