The study was conducted in an artificially formed fen, within the old basin of Skawinka river, in a municipal park located in the southwest part of Skawina town. The location and the conditions of the occurrence of selected species were characterized, by means of describing their positions and plotting them on the land survey and height map in the scale of 1 : 500 [Czarnota 1997]. The pH and salinity of the water were examined, the percentage of light reaching the plants was determined, and the organic matter content in the soil was measured. Understanding these conditions will make it possible to select the right species and varieties of plants, having the requirements compliant with the conditions existing in the tested water basin, which will enable their further development and maintaining attractive appearance.