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Ranunculus bulbs Brilliantly coloured flowers of Ranunculus is a great attraction! They most often come in multiple layers of delicate, crepe paper-thin petals, looking like an origami masterwork. Ranunculus are cool season flowers that grow best in spring-like temperatures of about 55°F. The corms are planted in the fall so they will bloom in late winter and early spring. Plant ranunculus in beds and borders, cutting gardens and containers.