Parks represent essential parts of urban environments, providing not only habitats for numerous plant and animal organisms but also positively impacting citizens' quality of life. People use them for recreation, relaxation, and connecting with nature, parks serving as places for learning and education about the environment while also playing a role in improving air quality in cities. The condition of parks reflects the culture of the community that uses and cares for them. The Park around the castle in Našice is situated in the very center of the town of Našice, covering an area of 56,08 hectares. The design of the park began in the 19th century and over time, the park was expanded and predominantly arranged in the English style. A portion of the park encompasses native oak forests and meadow areas. Field research conducted during the 2023 growing season in the Park around the castle in Našice revealed exceptional diversity in the vascular flora of the surveyed area, with 312 species of native and ornamental plants distributed across 89 plant families. Life forms and floristic elements were determined, emphasizing the presence of endangered, protected, strictly protected, and invasive alien species, highlighting the importance of preserving and protecting this and similar habitats