Abstract: The influence of five nitrogen sources on the growth of two monocotyledon species were investigated in the Trelogan mine spoil in a glasshouse experiment. A slow release nitrogen fertilizer was examined, in addition to the fast release sources, to assess its performance. Single and split doses of conventional nitrogen fertilizers were also used to compare their effects. There was no effect of single or split doses of urea an d NH4NO3 and the single application of slow release (Gold-N) on the growth characters of Festuca rubra and Anthoxanhum odoratum when compared to control treatment. Single application were less effective than split doses of conventional nitrogen sources