I know how beautiful it is. I've got it at home. I've had it for about seven years. It's because it's so close to my black walnut tree. That makes sense.
Black walnuts produce a toxin that actually kills some plants.
So, it's probably keeping this one in check a little bit. Maybe we discovered a new way to control aggressive perennials. This is a plant called Houttuynia, a cultivar called Chameleon, which I would not put in the ground, ever. It's got very, very aggressive roots. You can see them here.