The wisteria vine bloom at a Sierra Madre home near Los Angeles, California, the United States, March 14, 2013. The wisteria vine, planted 1894 and recorded by the Guinness Book of World Records as the world's largest blossoming plant, covers an area of more than one acreand weighs 250 around tons. It has more than 1.5 million blossoms every year with 40 blooms per square foot. [Xinhua/Zhao Hanrong]