Try Vincas a.k.a. Periwinkles. They come in white, light pink, hot pink, purple, and some white and red mix. There may be more but these are the common colors I believe. Anyway, they are hardy and they will make a relatively good size plant. Space them out about 6-8 inches apart for a real good cover or about a foot to get the look of single plants. i like mine close together. They will also return the following spring (volunteer) if you work the dead blooms into the soil about an inch or so down. I normally just use a small, hand held, three prong rake to dig around in the dirt where the plant are and this seems to do the trick. When the cold weather sets in and the plants start to die I just pull them up.
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