The paper presented the ecological differentiations of flora and vegetation in the area of Siemonia sandpit. The investigations carried out the surfaces with spontaneous succession. The result of researches showed occurrences of 233 species of vascular plants which belonged in more 50 families. The diversity of species in the area is conditioned by phases/stages of vegetation succession, features of ground and exterior factors. There also were noticed the formation of initial plant associations which participations protected plant species
