UPDATE 2021: In 2020 I decided to rip out as much of this as I could and replant the bed with something else (which ended up being hardy geraniums). It was a bear to extract all those little roots, but I did a pretty good job because I only got a few sprouts in 2021.

I planted this early on outside our front door in the corner of built-in bed thats contained on all sides by either brick or concrete. It has nearly filled that container and attempts to jump ship over into the rockery next to the sidewalk every year. This plant is beautiful in spring and early summer, and does a nice job of decorating a tough spot that is shaded most of the day by our detached garage. However, it’s roots are fibrous and tough which make it very difficult to pull, and it gets shaggy and rusty toward the end of summer.