Perennials: How should I remove an enormous Sisyrinchium crown, 2 by Pistil

Pistil wrote:
Hi cinemike-
I was looking for something else and ran across these photos I took of my removal project. At this point I has removed about 3/4 of the solid raised crown with my saw! I was taking a break as the saw had overheated, as had I. This gives a good view of the size, solidity, and how high it had gotten. What an awful chore that was. The good news is that I have only had one little sprout come up, even though I did not dig it out. How about you?