The Ranunculus numerous purple petals give these plants a delicate appearance in spite of their showy colors. The flowers sprout from tuberous roots. Ranunculus plants can be grown as either annuals or perennials. Most commonly, the flowers are cultivated as cool-season tender perennials.  Bulb size: Jumbo. Weeks to bloom: 10 to 16. 10" to 12". HZ: 8-10.