Abstract
The capability of higher plants to improve the quality of artificial wastewater (Otsuka-House Fertilizer Series A medium, 0.5 dS m-1) varied with the species and with the growth conditions. In the warm season, water convolvulus showed more activity than mint, jute or water hyacinth (a plant widely used against eutrophication). In the cold season, calla lily showed the highest level of activity. Thus, the plant species need to be selected depending on the season. Water convolvulus is a green leaf vegetable with medicinal value, and calla lily is an ornamental plant. Both plants can be effectively used to improve water quality and as useful resources after harvest.
