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We assessed the capacity for nutrient removal of ornamental water garden plants being grown in treatment-production wetland biofilters. Plant biomass, nutrient uptake, tissue nutrient content, and production potential were compared for five popular ornamental water garden plant species:  Typha latifolia  L.,  Iris pseudacorus  L.,  Phalaris arundinacea  L. `Picta',  Canna glauca  L., and  Colocasia esculenta  (L.) Schott. Plants were grown in triplicate 0.3 m 2  × 0.3 m, deep gravelbed mesocosms fed with 20N-20P-20K Peter's fertilizer (Scotts-Sierra Horticultural Products Co., Marysville, Ohio) reconstituted to 100 ppm N. After 120 days, mean species total biomass ranged from 1.4 to 5.6 kg·m  -2 , while producing 105 to 206 divisions per square meter. Growth for  Canna  and  Colocasia  was greatest, while  Typha  produced the most divisions. Mean tissue N and P concentrations ranged from 18 to 29 and 2.1 to 3.0 mg·g  -1 , respectively. Maximum plant accumulation of 144 g N/m  2  and 15.6 g P/m 2  accounted for 70% of the N and 15% of the P supplied by fertilizer. Mean removal of total N and P ranged from 42% to 90% and 18% to 58%, respectively, and was positively correlated with plant biomass. Nutrient removal ability was ranked as  Canna = Colocasia &gt; Typha &gt; Iris = Phalaris.

447 Nutrient Removal by Five Ornamental Wetland Plant Species Grown in Treatment-production Wetland Biofilters