It's called mile-a-minute weed or "forest killer." Mikania micrantha is an exotic, invasive species that spreads quickly, covering crops, smothering trees and rapidly altering the environment.

"Mikaniais considered one of the world's worst invader weeds, and it is having a significant impact on agriculture in India and China. If there are crop species, it will grow over them. It grows extremely fast, up and over trees, as quickly as three inches per day."