In this Monday, Oct. 1, 2012 photo, farming director Sam Brake bends a stalk of Arundo donax toward the ground in a test plot behind the Biofuels Center of North Carolina in Oxford, N.C

 

              In this Monday, Oct. 1, 2012 photo, farming director Sam Brake bends a stalk of Arundo donax toward the ground in a test plot behind the Biofuels Center of North Carolina in Oxford, N.C
In this Monday, Oct. 1, 2012 photo, farming director Sam Brake bends a stalk of Arundo donax toward the ground in a test plot behind the Biofuels Center of North Carolina in Oxford, N.C. The center is promoting the Asian transplant, but at least three states have already banned "giant reed" as invasive. (AP Photo/Allen Breed)