| Summary: | Soil salinity is one of the particularly important environmental factors, which limits the growth and development of plants, reduces the amount of crops and causes serious economic damage. The study found that <i>Festuca arundinacea</i> can be successfully used for the management and bioremediation of saline habitats, and it is characterized by a very well-developed root system and an average high biomass production of approx. 14.8 Mg∙ha<sup>−1</sup>, which can be used for industrial applications. Tall fescue biomass from soils with different levels of salinity was used to obtain bioethanol using 1.5% NaOH pretreatment and for the process of simultaneous enzymatic hydrolysis and ethanol fermentation (SSF). It was found that the content of Na<sup>+</sup> ions in the tall fescue biomass had no significant effect on the amount of ethanol obtained (the average 19.32 g∙100 g<sup>−1</sup> of raw material). <i>F. arundinacea</i> biomass was also used as a natural filler to obtain green composites using a biodegradable polylactide (PLA) matrix. It has been shown that tall fescue biomass with the lowest sodium content in biomass (approx. 2.5 mg∙g<sup>−1</sup>) from an area with high saline (above 6 g NaCl∙L<sup>−1</sup>) has the smallest effect on reducing the tensile and flexural strength of composites. Moreover, the highest value of bioethanol concentration (21.2 g∙100 g<sup>−1</sup> of raw material) for this biomass sample was obtained.
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