Put a pot of Gerbera daisies in your bedroom! Most plants release oxygen during the day, but these daisies release it at night. So they can help you sleep better. Plus, a study from NASA found Gerbera daisies are one of the most effective plants at removing benzene from the air. That’s a chemical in household products linked to headaches, eye irritation, and even cancer. And put the Gerbera daisies by a window, because they need sun. And when the blooms droop and die, pinch them off to stimulate new growth.