The paper presents a complex characteristics of grassland communities situated in the valley of the Samica Leszczyńska River, in the village Błotkowo (Wielkopolskie Voivoidship, Leszczyński County). It contains a detailed description and interpretation of soil conditions and phytosociological research, which is connected with it. On the basis of phytosociological relevés, floristic composition of the sward was determined. The following communities were described: Phragmitetum australis, Scirpetum silvatici, Arrhenatheretum elatioris, Caricetum ripariae. Four soil profiles were made. Such soil parameters as pH, content of total carbon, soil texture, bulk density and particle density, total porosity, saturated hydraulic conductivity, maximal hygroscopic capacity, soil potential of binding water and its total and readily available water. The investigated soils represents various soil types. They were formed from peat sediments, moorshiefied in various stage, overlying gyttja (peat and moorsh soil types), as well as from river sediments (Haplic Fluvisol). Their trophism differed. The groundwater level in soils appeared on various depths. A system of basic physical and chemical properties was typical to Polish soils of similar origin, texture and organic matter content.