Plant in full sun or light shade and well-drained soil. Sandy soil is ideal. Allium leaves will yellow by the time the flowers open. You can disguise the foliage by planting large alliums among bushy perennials or shrubs, and small alliums among low-growing perennials. The flower heads of large-headed alliums remain attractive even after the color fades. They can be left in the garden or cut and dried for use in indoor arrangements. Species alliums (e.g., siculum, moly) may self-sow.