Plant floristic composition of Mościckie Meadows situated in the Leniwa Noteć River valley exhibits considerable variability. Semi-natural communities of high natural values, primarily from the Phragmitetea class, are dominant. Semi-natural character of the examined communities was particularly common in the case of marshy and wet sites on which utilization was either significantly reduced or completely abandoned in recent years. The natural value of these communities can be preserved if the domestic Agro-environmental Program is implemented. The study presents characteristics of floristic and soil variability of ecological meadow communities situated on organic soils. Analyses of floristic composition and moisture content variability of the following syntaxonomic units were carried out: Phalaridetum arundinaceae var. with Urtica dioica, com. Angelico-Cirsietum oleracei and ass. Filipendulion ulmariae and Polygonum hydropiper var. with Rumex crispus. In addition, results of nature valorisation for the above-mentioned plant communities were described. The performed soil drillings and pits made it possible to describe soil morphological structure and to carry out their typological, natural and functional classification. Basic physical and chemical properties were determined using methods commonly employed in soil science.