I have just dug my elecampane roots at the end of their second year. We are into January so we have had a number of frosts/freezes. As I am slicing the lateral roots I see that some are the nice pale color I was expecting but most of them have dark, almost black, growth rings. Is this normal? Are the dark ones okay? The roots look healthy from the outside. Is this because I waited until well into winter to harvest them? Also, is the bulbous part just below the ground good medically or are the lateral roots better?