How do I kill Birds of Paradise roots?

[thomas Birkenstock]

replying to Scott Simpson, thomas Birkenstock wrote: i use lb of salt a cup of dawn dish soap and a gallon of viniger cut all flower and old stems and live ones out when u hve a pad of bulblike roots too big to dig pour the liquid over it once a month..........ROUNDUP is sososossoosossoso Tox ic to enviorment,and people. i cant believe its still sold!.

[MKH]

replying to Felder, MKH wrote: I can't help but comment that you've not tried to dig up Bird of Paradise. It is impossible, except perhaps with a backhoe!