The paper presents the results of the research on plant communities in arable fields in Wroc³aw city (a capital of Lower Silesia, in the south-west of Poland). The investigations were carried on applying the commonly accepted Braun- Blanquet method. Two plant associations have been identified in cereal fields of the investigated area: Vicietum tetraspermae and Aphano-Matricarietum. The first of the mentioned associations developed worse than the second one which is its geographical substitute. Two other associations have been identified in fields containing root crops: Galinsogo-Setarietum and Echinochloo-Setarietum. All of these associations occur in surrounding areas of the city in specific habitats which indicate particular soil reaction, moisture content and nitrogen reserves.