In accordance with the principle of sustainable development, contemporary trends in the development of Urban Natural Systems involve: indicating areas which perform environmental functions, preserving connectivity between them, and establishing connection between these areas and the regional and national systems of ecological structures. Completing these steps is the only way to preserve the sustainability of ecological structures and their self-regulating capacities, pivotal qualities for ever-changing urban conditions. The aim of this work is to analyse the vegetation cover of Świdnik – a dormitory town for the capital city of the Lublin Province – and prepare an index of plants which, if introduced in a thought-out and consistent way, can enhance its biodiversity. Such framework would, first and foremost, help to protect the natural environment, and secondly, outline appropriate guidelines for urban vegetation development. Two methods have been chosen to identify the vegetation resources of Świdnik. The first one is closely related to spatial planning process – an ecophysiographic study, and the other one to specialist studies – phytosociology, (i.e., the analysis of vegetation cover in the spatial complexes of Świdnik). The ecophysiographic study identified strategic areas for the development of the Urban Natural System, as well as the preferable direction of its development. The vegetation cover analysis has shown what qualities should be taken into account when creating an individual index of plant species for particular urban units