The pretty and delicate Asiatic Dayflower, Commelina communis, the individual blooms of which last a mere 24 hours, hence the name, can quickly soak up toxic copper ions from contaminated soil. The plant, which is native to much of East Asia and the northern part of Southeast Asia, is known as yazhicao but is known as a noxious weed outside the region.
Click here for original story, What a difference a dayflower makes: Plant removes toxic copper ions from contaminated soil
Source: Phys.org