From the rhizosphere of investigated pot plants six Verticillium species (V. alboatrum, V. dahliae, V. nigrescens, V. nubilum, V. album and V. fusisporum), potentially dangerous to plants, were isolated. Most often colonized rhizospheres of diseased pot plants by Verticillium album were those of Peperomia obtusifolia and Calathea picturata (relative density 8%). Relative density of Verticillim group in other sick plants rhizosphere was up to 4% whereas that of the healthy looking plants varied from 1 to 3%. Pot plants are very sensitive to factors unfavourable to their growth.