In 1876 Kudzu was brought from Japan. In the 1930s it was planted extensively in southern states to control soil erosion. It not only controlled erosion, it smothered any plants in the surrounding area. As a vine, it grows densely and quickly. Primarily in southeastern states, Kudzu covers more than seven million acres and spreads to about 120,000 new acres each year with an average of $300 million in damage per year.
Kudzu is semi-woody and has large, trifoliate leaves. Its vines can grow up to one foot a day in every direction during early summer and travel more than 60 feet in one year. Huge starchy, tuberous roots weighing up to 300 pounds and reaching a depth of 12 feet in the soil aid its survival. It is not uncommon to have tens of thousands of plants per acre in established stands.