This tree is widely planted in northeastern regions, sometimes spreading by seed, and "occasionally becoming a weedy pest" (FNA 3, PL). In Ky. there have been unverified reports of escapes from plantings, especially on strip mines (CW; T. Kimmerer, pers. comm.). In a few cases, labels on colls. indicate naturalization (e.g. R. Thompson #2093 from BELL), but definitive evidence of seedlings is not yet available.