Triffid

s were dangerous plants. (PROSE: The Secret in Vault 13) When Sarah Jane Smith told Gita Chandra that her contacts were not usually interested in flowers, Clyde Langer quipped "unless they're Triffids." (TV: Prisoner of the Judoon) The potted plant in the Director-General's office was a Triffid of shoulder height. (PROSE: Not So Much a Programme, More a Way of Life)

Behind the scenes
Triffids are fictional main antagonists of 's novel The Day of the Triffids. However, it is not stated in-universe whether they are fictional in DWU.