Looking for a border flower
Hello everyone. . . I'm new here. I'm working on replanting a large raised box at my parents' home. They made a lot of mistakes with perrenial no nos the first time around. They'd like to have some dwarf bushes in the back(read your great forum on that, so helpful!). In the front, I was thinking of a small purple flower I've seen in other raised boxes. It is low, spreads into itself and drapes over the front of the box just a bit. Makes a stunning display to the front of a raised box. Anyone know what this plant is, or can anyone suggest something similar that would work and not spread beyond its border?
Bed receives full sun, southern exposure. thank you!