A maze made of hedge
A hedge was a row of bushes arranged in a fence-like pattern.
In 2267, while on the Shore Leave Planet, Leonard McCoy described Alice and the White Rabbit as having disappeared through a hole in the hedge. (TOS: "Shore Leave")
In 2270, Doctor McCoy, Hikaru Sulu and Nyota Uhura were in the rec room, using a holoprogram with a large hedge maze. (TAS: "The Practical Joker")