Corn, sugar cane, and sorghum are C4 plants. Rice, sugar cane, fruits and vegetables are also grown. Cash crops include sugar cane and rapeseed. It is primarily made from fermented sugar cane. New crops such as sugar cane, vanilla and tobacco were introduced. New cash crops such as wheat, tobacco, sugar cane and cotton were introduced. Sugar also led to some industrialization of areas where sugar cane was grown. It is third in the production of peanuts, mango and sugar cane. It is difficult to distinguish between fully refined sugar produced from beet and cane. It was used as a sweetener before the arrival in Europe of cane sugar. Instead they began to cultivate and process the sugar cane. This resulted in a shortage that revived the shrinking cane sugar industry. Only a light rattan cane may be used. There are forests of teak, pine, oak, uningthou, leihao, bamboo, and cane. The exact date of the first cane sugar production is unclear.