This stunning clematis is long-blooming and easy to grow! 'Diamond Ball' clematis is a prolific bloomer with double flowers appearing on old and new wood from June through August. The large, cool white-icy blue flowers are round or semi-spherical in shape and reach 4-5" in diameter. ‘Diamond Ball’ clematis adds vertical interest to any garden or landscape. This beautiful vine will grow on really any structure you provide, a trellis, fence, or mailbox. ‘Diamond Ball’ clematis was developed by breeder Szczepan Marczynski of Poland.