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

Expertly curated flower paintings, the garage-rock star’s hazy expressionism and a masterpiece from a Morrisons receipt – all in your weekly dispatch

Handpicked: Painting Flowers from 1900 to Today
Jim and Helen Ede, founders of Kettle’s Yard, cared almost as much about the fresh cut flowers in their gallery as the art. This show looks at artists who share that floral passion, from Henri Rousseau to Lubaina Himid.
• Kettle’s Yard, Cambridge, 25 April to 6 September