The paper presents new sites of 14 non-native vascular plant species in central and eastern Poland. They concern both frequently recorded species, whose distribution seems to be regionally underestimated (Aesculus hippocastanum, Amorpha fruticosa, Fraxinus pennsylvanica, Quercus rubra, Sorbaria sorbifolia, Syringa vulgaris), being in the initial stage of invasion in the region (Juglans regia), recently recognized by some authors as invasive (Symphoricarpos albus) as well as rarely, especially regionally, noted (Ambrosia artemisiifolia, Cerasus mahaleb, Elodea nuttallii, Senecio inaequidens, Vaccinium corymbosum).