Approximately 15% of the land of Zhang Xian County is under-cultivation, primarily due to two factors: a short growing season (155 frost-free days annually) and limited arable land. The construction of 7,000 s.f. state-of-art greenhouse, the first owned and operated by the women of Zhang Xian, enables them to plant mushrooms, medicinal herbs and other fruits and vegetables that fetch high prices at the market place. The project was completed in 2002.