Studies were conducted in production conditions on 42 plantations of Areta, Leo, Nakielska, Nimba and Reda cultivars situated in the neighbourhood of Koło in Wielkopolska (Great Poland) region. The examined plantations, similar with regard to site conditions and agronomical practices, differed with regard to the level and date of mineral fertilisation. Seed plantations of the above listed cultivars were situated on mineral soils formed from medium sand characterised by medium or low macro element content and pH ranging from 5.5-6.5. Experiments were carried out in three stages. The first stage comprised a questionnaire survey concerning information about the technology of seed production of Festuca rubra cultivars. In the second stage, empirical studies were initiated. These involved selection of representative parts of plantations of 100 m² area in four replications on which assessment of weed infestation, development of generative shoots and structure of their inflorescences was performed. The effectiveness of plantations was determined on the basis of the harvested seed crop. Results obtained in the last stage of experiments were subjected to the analysis of variance with the aim to determine significance of difference between plots. The trait correlation was measured using a correlation coefficient. Moreover, seed production profitability was analysed using the method of differential calculation. In the light of the performed investigations it was found that cultivars of Festuca rubra were characterised by a considerable diversification of their yields, development of generative shoots and structure of inflorescences. From among the examined cultivars, Leo distinguished favourably in this regard, whereas Nimba was found to exhibit negative characters in this regard. The number of developed inflorescence shoots exerts a significantly positive influence on yields of Festuca rubra plantations. This effect is most conspicuous in the case of Nakielska cultivar (r=0.779**). Furthermore, plantation yields were also affected by the number of spikelets in inflorescences as evidenced most distinetly by Leo cultivar (r=0.677*) . Within individual cultivars of Festuca rubra aconsiderable variability in plantation yields, development of generative shoots and inflorescence structure was observed. The source of this variability, when differences in the effect of site and weather conditions are ruled out, is undoubtedly fertilisation. It was demonstrated that NPK fertilisation, especially fertilisation with nitrogen applied both in autumn and early spring, exerted a strong influence on the seed yield of all the examined cultivars. The size and timing of applied fertiliser doses must be adjusted to cultivar specificity. There is a specific effect of the application timing with the nitrogen fertiliser on the development of generative shoots of Festuca rubra. Leo cultivar responds positively to increased nitrogen fertilisation in early spring, while Areta, Nakielska, Nimba and Reda cultivars prefer this fertiliser to be applied in autumn. Profitability of seed production of individual Festuca rubra cultivars depends primarily on the yield of seeds harvested from a given plantation. The highest direct surplus was recorded in the case of Leo cultivar. It has been concluded that that there are considerable possibilities of development of seed production of Festuca rubra on poor sites provided plants are satisfactorily supplied with nutrients in the form of fertilisers.