A first investigation on the horticultural flora of the Annaba region (North-East Algeria): Biodiversity and socio-ecological interest. — The present study was undertaken with the aim of improving knowledge and proposing a first checklist of horticultural plants present in public and private green spaces in the region of Annaba (northeastern Algeria). During the period from 2018 to 2021, a total of 164 taxa recorded. The results obtained are given in terms of floristic composition, forms of life, type of nativity and socio-ecological interest of the plants observed. However, the real impact of potentially invasive species on plant communities and ecosystems deserves urgent assessment with specific studies.