The objective of the research was to determine and compare the value of the heat of combustion of waste biomass in the form of above-ground parts of the selected species of herbs. The research included leaved stalks of milk thistle, non-leaved stalks of thyme and garden sage and inflorescence axes of lavender and fennel. The heat of combustion of waste biomass was determined with the use of a calorimeter according to the applicable standard PN-EN ISO 9831:2005. Based on the obtained results it was stated, inter alia, that, from among the investigated species the lowest average value of the heat of combustion of 13.28 MJ∙kg-1 was in case of biomass obtained from milk thistle. The heat of combustion of biomass of the remaining species was similar and it was at the average of 20.47 MJ∙kg-1. Weight of ash after combustion was the highest in case of milk thistle and it was 0.23 g whereas in case of the remaining species it did not exceed 0.03 g.