Blueberry Smoothie Hibiscus is the color of blueberries blended with yogurt. From early summer to frost, this hibiscus is covered with huge double blooms that look too perfect to be real. Looking a bit like poufy paper flowers and a bit like roses, the unusual pastel purple blue blossoms are certain to brighten any landscape. Also, this is a sterile plant, meaning no messy seed pods. Blueberry Smoothie makes an outstanding privacy hedge, or it can be grown in a container. A low maintenance ornamental, it also attracts butterflies and hummingbirds.