[header] How to harvest kudzu [title] Know how to identify it. [step] Kudzu has large, green vines that can climb as high as 100 feet (30 m) in trees. The leaves have three-parts and are between 4-6 inches (10.2-15. 2 cm) in length. 
The flowers are purple and smell strongly of grapes. The roots are thick and go deep underground.