Fountain-like centers on huge 4-5" semi-double lilac blue flowers. Crystal Fountain is compact enough for containers. Blooms June through September. Modest in height this is a perfect choice for the garden with limited space. Can sprawl along the ground too! Gracefully meandering over fences, trellises or through shrubbery, Clematis supply vertical interest. Every perennial garden should have at least one of these incredible vines.