Petal passion, super-surreal Polaroids and Billy Childish’s California – the week in art

This week’s art roundup highlights several major exhibitions across the UK, including a floral-themed survey at Kettle’s Yard featuring artists from Henri Rousseau to Lubaina Himid. Other notable openings include Billy Childish’s expressionistic California desert paintings at Carl Freedman Gallery, Katharina Grosse’s site-specific installations at White Cube, and Steve McQueen’s new photography book, 'Bounty', which explores the colonial history of Grenada through its flora.