Some couples work hand-in-hand. Many appreciate the beauty of the natural world. Few combine the two as romantically as Yu Feng and Chen Zhongyi: They have dedicated their lives to botanical science, art and love. Plants brought them together. Yu is a professional botanical artist. Chen is a plant taxonomist at the South China Botanical Garden in Guangzhou. They have been married for 47 years, growing with botanical research from the bright bloom of youth to their graying older years.