Pinus nigra
In both the US and UK most of the specimens planted are from Austrian sources, the "Pinus nigra" subsp. "nigra" and "Pinus nigra" subsp. "nigra" var. "nigra" seed selections. In the late 1950s and early 1960s, when demand for natural trees was extremely high, its rapid growth, deep green color and low cost made it briefly a popular Christmas tree, but the extreme length of the needles (making it very difficult to decorate) soon led to its fall from favor, and it has long since been abandoned in the US for that purpose.