A random blocks experiment was set up at the Experimental Farm Felin of the  University of Life Sciences in Lublin. In the years 2005-2007 (third-fifth year of cultivation of Virginia fanpetals) a study was conducted on the effect of two levels of nitrogen fertilization (100 and 200 kg N ha^–1) on the structure elements and level of biomass yields. The heat of combustion was also determined, and on that basis the energy value of the biomass yield was calculated. The higher dose of nitrogen caused an increase in shoot height, thickness at the base, and shoot mass of Virginia fanpetals. There was also an increase in the number of shoots per meter square and in the yield of biomass (13.55 t ha^–1). At the heat of combustion of 18 MJ kg^–1 d.m. the highest energy value (299 GJ ha^–1) of the yield was obtained in the fifth year of use of the plantation, at the higher level of nitrogen fertilization.