Hi.. the difficult part of this area is that it gets too much water from a less than ideal irrigation system. last year we have impatients in there and they just limped out, while the ones just to the side were fine. So now i'm looking to put something in this area more permanent. It's only about 12" deep and 6' wide, long and narrow along a walkway. I thought perhaps begenia but might be too big??? any ideas are welcome! thanks!