Aspen is noted for its ability to regenerate vegetatively by shoots and suckers arising along its long lateral roots. Root sprouting results in many genetically identical trees, in aggregate, called a "clone". All the trees in a clone have identical characteristics and share a root structure. The bark and leaf of the tree are used to make medicine. Aspen is used in combination with other herbs for treating joint pain (rheumatism), prostate discomforts, back trouble (sciatica), nerve pain (neuralgia), and bladder problems.