I have an area in front of my house that is surrounded by driveway, so any
plant would be confined no matter how invasive it is. Right now it is full
of lilies of the valley, which are certainly invasive but they don't like it
there and get ratty looking by mid-summer.

So I'm looking for suggestions. Something different, interesting and
bullet-proof, requiring zero maintenance once established. Won't be walked
on much by people, but dogs will use the area. It's raised and steeply
sloped so not easy to mow.

The area is 20 ft by 10 feet, east facing, partial sun, lots of water off a
porch roof. Zone 5 (Eastern Ontario). Sandy, well drained soil.

I saw a type of bamboo grass on a PBS gardening show, which is the kind of
thing that might work. It looked quite attractive.

Any ideas?