The floristic investigations were conducted on three spoil heaps situated in the town of Ruda Śląska. The aim of the study was to determine similarities and differences among spoil heaps based on qualitative and quantitative analyses of the flora. There were 248 species of vascular plants observed on the investigated objects. The native species (apophytes) dominate in the spoil heaps flora (above 80%). The most numerous life forms are hernicryptophytes. The rudera) and meadow species are the most abundant among ecological groups. The analysis of the ecological indicators shows predominance of heliophilous species, which prefer temperate thermal and moisture conditions. The investigated flora demonstrates large tolerance spectrum of trophism and pH of soil.