This paper presents the results of research concerning the initial growth and the development of selected species (varieties) of law grasses sown on extensive lawns. The research studied the effects of various doses of sludge (0, 70, 140, 210, 280 t/ha), lawn grass mixes (fescue and tussock-grass) times of sludge application and times of sowing seeds on the development of lawn grasses in the Department of Grasslands, University of Warmia and Mazury in Olsztyn. The following features were assessed in the sowing year: beginning and peak of emergence, plant tilling and the general aspect of the grass at the end of a vegetative season, using the 9^o scale. A significant impact of domestic sewage sludge on plant tilling and the general appearance of the grass was observed. As regards the mixes under examination, the fescue mix developed more favourable qualities, such as plant emergence and peak of emergence, than the tussock-grass mix. The plant tilling and general aspect of both lawn grass mixes sown was similar. Plant emergence (beginning and peak), plant tilling and the general aspect of the grasses was better under the combination of springtime sludge application and summer sowing.