<P> Due to its high levels of rooting hormones, P. trichocarpa sprouts readily . After logging operations, it sometimes regenerates naturally from rooting of partially buried fragments of branches or from stumps . Sprouting from roots also occurs . The species also has the ability to abscise shoots complete with green leaves . These shoots drop to the ground and may root where they fall or may be dispersed by water transport . In some situations, abscission may be one means of colonizing exposed sandbars . </P> <P> The native range of P. trichocarpa covers large sections of western North America . It extends northeast from Kodiak Island along Cook Inlet to latitude 62 ° 30 ° N., then southeast in southeast Alaska and British Columbia to the forested areas of Washington and Oregon, to the mountains in southern California and northern Baja California (lat. 31 ° N .). It is also found inland, generally on the west side of the Rocky Mountains, in British Columbia, western Alberta, western Montana, and northern Idaho . Scattered small populations have been noted in southeastern Alberta, eastern Montana, western North Dakota, western Wyoming, Utah, and Nevada . It grows up to elevations of 2100 m . </P> <P> Populus trichocarpa has been one of the most successful introductions of trees to the otherwise almost treeless Faroe Islands . </P> <P> The species was imported from Alaska to Iceland in 1944 and has since become one of the most widespread trees in the country . </P>

The genome of black cottonwood populus trichocarpa (torr. & gray)