Hardy to zone 5 this deciduous vine is native to the southeastern and south-central US where it grows primarily along streams and in moist woods. It grows to about 30 feet tall and will be found climbing among trees and shrubs. It's large heart-shaped leaves are four to eight inches wide and long, and will grow so abundantly on the vines that the pipe-shaped (for which it receives it name) greenish-yellow flowers are rarely seen but can be found upon close examination in late spring or early summer. A very difficult plant to find in garden centers, and this is the first year these vine have flowered for me.
