In Stratford-upon-Avon, Miss. Montague (blue) and Mr. Capulet (red) (Julie Walters and Richard Wilson (Scottish actor)) are two elderly neighbors who despise each other. When they leave their respective gardens, their garden gnomes and other lawn ornaments come alive. The Montague garden is filled with blue-hat gnomes led by Lady Bluebury (Maggie Smith), and the Capulet garden has red-hat gnomes led by Lord Redbrick (Michael Caine). Like their human gardeners, the gnomes also despise each other. The gnomes hold a back alley lawnmower race. Lady Bluebury's son Gnomeo (James McAvoy) races against his rival, Tybalt (Jason Statham), in which Tybalt destroys Gnomeo's lawn mower.