What is the fastest growing plant?

The fastest growing plant is bamboo. According to Guinness World Records, one species of bamboo is capable of growing up to 35 inches per day.

Bamboo is used very much like wood from trees. It is used to make flooring and other building material as well as musical instruments and kitchenware. Bamboo is a grass that grows mostly by way of underground rhizomes, which send the stems of new plants up through the ground. The rapid growth allows bamboo to be a sustainable resource. A stand of bamboo can be ready for harvest in as little as five years and grows back.