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How to Grow Buttercup-Ranunculus. Buttercup flowers are members of the Ranunculus genus, a large family (about 400 species) of flowers.These bright, yellow, five-petaled summer bloomers, are native to Asia, Australia, Central America, North America and Europe.ow to Grow Buttercup-Ranunculus. Buttercup flowers are members of the Ranunculus genus, a large family (about 400 species) of flowers.
Ranunculus buttercup plants produce cheery multi-petaled flowers. The almost unpronounceable name covers a large group of perennials from Asia and Europe. The plants arenât very hardy and may be annual in colder zones. They are easily damaged by temperatures below 28 F. (-2 C), and thrive best in USDA zones 8 to 10.anunculus Buttercup Plants. A colorful field of flowers livens up the landscape and is easy to achieve with Ranunculus plants. Ranunculus bulbs come in several sizes and are best planted 4 inches apart.