And what is your evidence for that is what? Botanical?
The "root" dies when it is separated from the surface skin in rats:
McKay Hart A, Brannstrom T, Wiberg M, Terenghi G.
"Primary sensory neurons and satellite cells after peripheral axotomy in the adult rat: timecourse of cell death and elimination."
Experimental Brain Research. 2002 Feb;142(3):308-318.