I am looking for a low (6" or under), evergreen groundcover for a mostly shady, smaller area on the north of my house. Ideally not too agressive, and it will be near rhodos & their shallow roots (if that matters). This time of year, it gets no direct sunshine, but in the summer, it will get a few hours of late afternoon sun. However, it is also probable that my Cornus Alba will provide enough shade once the leaves are out, that direct sunshine won't be available. I already have some pachysandra in another area, so I'm looking for something a little lower, maybe with flowers, and maybe a little more delicate. I'm wondering about periwinkle or ajuga -- but I've heard both can be aggressive. This will be in a bed right against a lawn, so I'd need something that can be easily kept out of the lawn. Any ideas? I don't know very much about good groundcovers for this area (Surrey, BC). Thanks in advance!!