The fastest growing thing in the world is a thing called Kudzu. it is native to China and Japan but can be found in other places it is a type of Vine and is from the Pea family. another name for this vine is Mile-a-minute vine because of the rate at which it grows. kudzu plants grow very rapidly, extending as much as 20 m (60 ft) per season at a rate of about 30 cm (12 in) per day. The Kudzu has been known to kill huge trees by growing on them an rapping itself around it thus not allowing the tree to get any sunlight.