All of the Shan Tong seedlings would be processed and maintained freshness strictly before delivering. The superficial color of Shan Tong seedlings, which after a series of procedures, is red. This professional postharvest technique owned by Weinan Research & Promotion Center for High Resistance Paulownia exclusively. It’s very difficult for people to imitate this professional postharvest technique because of its complicated and advanced technology. To be clearly, pure Shan Tong is the one which color in red, maintain fresh and no affected by bacteria.