Abstract— The aim of the article is a theoretical evaluation of the possibilities of using fast-growing aquatic plants, specifically Lemna minor, for the mass production of biomass suitable for the subsequent thermal treatment during the blue hydrogen production process. Much laboratory research has demonstrated the possibility of increasing the volume of biomass under controlled conditions, using water from wastewater treatment plants, or water contaminated with organic residues (faeces) from organic production. Hydroponic cultivation in controlled conditions has shown the possibilities of removing hazardous substances from wastewater, possibly reducing their contamination and at the same time, producing organic biomass with more favourable properties than in the case of dendromass.