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Background. Trostianets Dendrological Park of the National Academy of Sciences of Ukraine, founded in the nineteenth century in Chernihiv Oblast and now within Ichnianskyi National Nature Park, combines historic plantations with distinct forest-meadow sites. It provides a workable model for assessing how long-term introductions, climate change, and recreation pressure reshape spontaneous floras of the Left-Bank Forest-Steppe. Materials and Methods. In 2022–2024, we inventoried all wild vascular plants. For each taxon, we noted native or alien status, geographical element (Kleopov, 1990), life form (Clements, 1920; Raunkiaer, 1934), vegetation class (EuroVegChecklist), and CSR strategy. Results and Discussion. The inventory lists 423 species in 73 families, among which native plants (70.92 %) dominate. The geographical spectrum is dominated by widespread species (58.66 %), which are generally more anthropotolerant, while among zonal geoelements, species with “northern” (21.0 %) and “southern” (20.34 %) distribution types are nearly equally represented. Alien plants hail mainly from America (30.1 %) – almost all of them from North America – as well as from Asia and the Mediterranean (24.4 % each). In the biomorphological structure, perennial herbs prevail among native plants (66.3%), while short-lived herbs dominate among alien plants (38.2 %). Native plants richness peaks in Molinio-Arrhenatheretea, Carpino-Fagetea, and Trifolio-Geranietea, while alien plants cluster in Robinietea, Rhamno-Prunetea, and Sisymbrietea. Violents dominate both fractions (47.8 % natives, 43.4 % aliens); ISR reveals only a slight excess of stress-tolerators among natives and ruderals among aliens, confirming strong anthropogenic pressure. Conclusion. Trostianets Dendrological Park hosts a rich, anthropotolerant spontaneous flora that preserves a forest-steppe core while harbouring many naturalised introduced plants, mainly woody ergasiophygophytes (69.74 % among alien plants). Its balanced yet distorted geographical profile and near-equal stress-tolerant/ruderal ratios form a baseline for tracking vegetation change in historical parks and justify measures to curb further alien spread and maintain meadow–forest mosaics.