Phytotechnologies broadly refers to the use of plants to address contamination in the environment, including soil, groundwater, surface water, sediment, and waste streams such as leachate, acid mine drainage, and wastewater. Phytotechnologies are generally less energy-intensive, and less costly and require less operation and maintenance than more active treatment methods, such as excavation or pump and treat. The CLU-IN Phytotechnologies Focus Area has been updated to reflect the current state of the science, with an emphasis on design and monitoring considerations as well as applications for remediation and containment.