As a rule, water ranunculus when the soil feels dry 1 inch below the surface. Ranunculus prefers evenly moist soil but will suffer in soil that remains soggy as the corms and roots will rot. The solution, perhaps, is to grow ranunculus in containers so that you can move them to a cooler location if you get hit with high temperatures and the blooms begin to suffer. However, growing them as an annual for summer or fall blooming in the north can sometimes be a challenge as hot weather may strike at or near blooming time. In the south where they can be planted in the fall for late winter or early spring blooming this is not an issue. Temperatures above 70 degrees will cause ranunculus to slow or cease blooming. In fact, it prefers temperatures between 55 and 70 degrees. Ranunculus prefers full sun but does not like the heat. Growing Ranunculus Light and Temperature Requirements Ranunculus grows to heights of 1 to 2 feet with a similar spread. Flower colors range from white, yellow and orange to brilliant shades of red. Whether in the flowerbed or in containers on the deck, these flowers are showstoppers when it comes to color and beauty. These tender perennial plants can be grown as perennials in USDA plant hardiness zones 8 through 10 but must be grown as annuals in cooler zones. Here’s a list of the different varieties of Ranunculus. But the cultivated variety ( Ranunculus ‘asiaticus’), commonly referred to as Persian buttercups, produces large showy blooms that resemble roses. It includes the common buttercup that grows wild throughout the U.S. Ranunculus is a genus of plants that includes approximately 600 species of flowering plants.
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