When testing and evaluating constructed treatment wetland (CTW) performance, there is a tendency to focus on monitoring parameters for wastewater kinetics to meet discharge limits or water re-use standards, while the plant monitoring parameters (metrics) are neglected. This paper identifies six useful plant metrics, describes the plant monitoring methods, relates the parameters to CTW performance and assessment, and provides typical value ranges for parameters of plants commonly used in CTWs. Plant data are from pilot and full-scale CTWs, natural wetlands, and literature.

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