This widely planted tree, as the columnar cultivar "Lombardy poplar", does deserve distinction from the typical European black poplar, although it is often treated just as a horticultural form. It can spread locally with suckers but seedlings are unknown; only male plants are known in Ky. (CW). Colls. that have suggested escaped status are known from NELS (Greenwell 1935), PIKE (EKY, TENN) and OLDH (DHL), but the tree does not seem to become truly naturalized.