Garden gnomes were statues of gnomes which some people used to decorate their gardens.
K9 Mark III encountered a garden gnome in a greenhouse while pursuing George Tracey. (TV: A Girl's Best Friend)
Garden gnomes were sold at the florist's shop in which Fitz Kreiner worked. (PROSE: The Taint)
Peri Brown once found a garden gnome inside a potting shed on board the TARDIS. (PROSE: Superior Beings)
Clyde Langer, upon seeing the Gorgon's petrified victims in St Agnes Abbey, asked why they couldn't get garden gnomes like everyone else. (TV: Eye of the Gorgon)
After the Hornets departed Antonio's body, the Fourth Doctor took it to Nest Cottage, placed it in stasis, and used it as a garden gnome. (AUDIO: The Circus of Doom) The Doctor showed the garden gnome to Mike Yates when he first visited the Doctor's house; he thought it was "wretched". (AUDIO: The Stuff of Nightmares)
The Eleventh Doctor referred to the robot guardians of the gardens on planet Iros as "military garden gnomes", to which they took offence. (COMIC: Gnome Guard)
Geoffrey Jennings stole garden gnomes from work and kept them in his garden. He later lost his job because of the stolen gnomes. (AUDIO: The Curious Incident of the Doctor in the Night-Time)