Helophyte plants like Iris and Typha can help clean up water from wastewater treatment plants. In a study, these plants were grown in channels with wastewater flowing through them. The plants absorbed nitrogen and phosphorus from the water, with Iris being the most effective at removing these pollutants. The leaves of the plants absorbed the most nitrogen, while the rhizomes absorbed the most phosphorus. Overall, the plants removed between 6% to 19% of nitrogen and phosphorus from the water, showing their potential to improve water quality in freshwater ecosystems.