Discover if ranunculus are perennials in your area, and how to shield the corms from winter frost. Though a bit difficult to cultivate, ranunculus flowers are stunning. Once you have grown them, you might be curious—are ranunculus perennial, or will they need replanting? The answer relies on your location and how you manage your ranunculus. This guide details where ranunculus can endure and how to guard them against cold weather so they'll bloom again in spring.