The five-leaf akebia vine, or chocolate vine, is a perennial vine that is sometimes vigorous to a fault. The chocolate vine gets its moniker from the rich purplish-brown blooms that smother the vine and from the delicate chocolate scent of the flowers. Chocolate-scented flowers are unusual among hardy perennials, so this one attribute may endear this flowering vine to you, despite its ill-behaved growth habits.The vine produces glossy dark green leaves that are oval-shaped and grow in clusters of five. The vines produce many dangling purple flowers with three petals in the spring (March to May) soon after it is planted, sometimes followed by fruits that resemble eggplants late in the summer. The fruit it produces is edible, but not very palatable. If you choose to harvest the fruit, you may recognize that the akebia is related to the kiwi and has tiny black seeds embedded in the pulp.Plant the chocolate vine in the spring or fall, in average well-drained soil. Expect this vine to grow quickly; as much as 20 feet a year is possible. This plant has no serious pest or disease issues, which is one reason for its reputation as a rampant grower.