Salix babylonica but beyond China, it has not generally been as successfully cultivated as some of its hybrid derivatives, being sensitive to late-spring frosts. In the more humid climates of much of Europe and eastern North America, it is susceptible to a canker disease, willow anthracnose ("Marssonina salicicola"), which makes infected trees very short-lived and unsightly. "Salix babylonica" (Babylon willow) has many cultivars, including: Various cultivars of "Salix matsudana" (Chinese willow) are now often included within "Salix babylonica", treated more broadly, including: Yet other weeping willow cultivars are derived from interspecific "Salix" hybrids, including "S. babylonica" in their parentage. The most widely
Salix nigra numerous minute, down-covered seeds. The leaves turn a lemon yellow in the fall. It is typically found along streams and in swamps. "Salix gooddingii" (Goodding's willow) is sometimes included in "S. nigra" as a variety, as "S. nigra" var. "vallicola" Dudley; when included, this extends the species' range to western North America. However, the two are usually treated as distinct species. Another name occasionally used for black willow is "swamp willow", not to be confused with "Salix myrtilloides" (swamp willow). According to the National Register of Big Trees, the largest black willow tree in the US is in Hennepin, Minnesota.