In many countries, particularly in Asia; the original is more concentrated in northern China the fruits of Sophora japonica 
 From Liaoning in the north, south to Guangdong, Taiwan, East from Shandong west of Gansu, Sichuan and Yunnan. Common North China Plain and the Loess Plateau, altitude 1000 meters high zone could grow 
 Sophora japonica cold sex, likes the sun, little shade, intolerant of damp while the drought, poor growth in low-lying water at the deep roots, strict requirements on the soil, more resistance, barren, lime and mild saline-alkali soil (salinity of 0.15 %) can grow normally. But grow best in moist, fertile, deep, well drained sandy soil. Resistant to dust, and able to adapt to the urban street environment. Pests and diseases not much. Long life, strong resistance to drug charges.