What are the basic factors affecting Paulownia growth?

China has a vast territory, a variety of natural and geographical conditions and climate types. Proper understanding of the basic conditions for optimum growth of paulownia is the most basic requirement in the artificial cultivation of Paulownia. These basic conditions include: temperature, light, rainfall, air humidity, wind and other climatic conditions, soil texture, physical properties of soil moisture, soil nutrition, soil pH, soil salt content and other soil conditions, as well as the groundwater level, the altitude and other site conditions.