Shandong Shouguang Youxian Seedling Co., Ltd. Shandong colorful tomato seeds Shandong Shouguang Youxian Seedling Co., Ltd. Shandong Shouguang Youxian Seedling Co., Ltd. was established in 2005. The company is mainly committed to the introduction, testing, promotion and sales of tomato seeds. After the outbreak of tomato TY virus, a series of antiviral varieties were introduced, which were well received by growers.