1. Search through the Internet: You can search for sweet potato stalk exporters in Korean Yellow Pages or e-commerce platforms, and contact after finding relevant information.
2. Exhibition: You can participate in the Korea Food and Agriculture Export Exhibition and have face-to-face talks with the sweet potato stalk exporters.
3. Contact trading companies: You can find some Korean trading companies, which may provide services for exporting sweet potato stalks.
Please note that the export of sweet potato stalks needs to meet the import requirements and standards of Korea, so you need to understand and abide by relevant laws and regulations. At the same time, it is recommended that you consult a professional lawyer or trade expert before exporting to ensure that your export business is legal, safe and successful.