Prins Claus' has white flowers with broad purple stripes. Like most other crocus, it is ideal for naturalising and looks wonderful in large drifts. Alternatively it can be grown in a pot or pan, topped with grit, so that the delicate blooms can be admired at close quarters. Plant bulbs in autumn, 8-10cm (3-4in) deep in poor, gritty, well-drained soil. A sunny spot is important as sunshine will make the blooms open fully.