Two technologies of harvesting grass for seeds have been evaluated. Two species of grass have been tested: meadow fescue – Festuca pratensis Huds. and timothy - Phleum pratense L. It has been proven that, in terms of loss of seeds and their quality, single-phase harvesting is recommended for the meadow fescue, and two-phase harvesting for the timothy. Two-phase harvesting, as compared to the single-phase one, was characterized by greater labour (man-hours) and energy (kWh) demand. The differences expressed in directed numbers were for both species respectively 7.4% and 8.6%.