I live in an urban area where garden spots are rare. Because of this, I'd like to utilize all of my garden space, including a 3' x 20' strip between my fence and my alley. Both are on the north side of my lot, so the area primarily gets shade (the fence is 7' high, solid wood).

I would like to put in a plant that will do well in poor soil, yet look great, producing flowers that look and smell good. Any ideas would be appreciated.