This is Clitoria ternatea double blue, also known as Butterfly Pea, Blue Pea Vine. Growing at lengths of 15 feet this tropical vine attracts birds, bees, and butterflies. From the middle of Summer to early Fall this breathtaking vine blooms colors of Dark Blue, Blue, Violet, and Purple. This plant likes to live in full sun to partial shade. This plant is a larval host of the Long-tailed Skipper and Dorantes Longtail butterflies. USDA Hardiness Zones 10 to 11.