As a comment about Lambs' Ears (Stachys byzantina)
In 1985, I moved to a home in Centerville, OH (suburb of Dayton, OH) that had a very large clump of this plant. First thing I did was to rip it all out, as it was taking a lot of space.
From that point on, I never wanted to have it in the ground. It grows to a large clump (if not controlled). The neighbor, who lives across the street where I took the photos, has 3 different clumps of it and two of them reseeded themselves. I'm hoping the wind doesn't send seeds across the street.
The color is nice, the leaves are soft and nice to touch, but I don't want it growing unless I can grow it in a container and then deadhead the blooms before they go to seed.