I use this as a ground cover for a hosta bed. It has not overstepped its boundaries, although it does get a a bit over-eager in growth. I just pull it back to the ground, knowing it will rebound quickly. It does brighten up the shady corner, and offsets the hosta nicely. On the negative side - I cannot abide the smell of the foliage, which is quite sharp. I also find the variegation tends to revert back to solid green (I try to pull those out entirely but don't always get them all). As others have noted, I would hesitate to put this in a bed that cannot be closely controlled.