Flowers are difficult to come by in shady locations. Both oleanders and crapes can't cut it in the shade. Some plants to consider include azaleas, camellias, pieris, hydrangeas. If the shade is fairly bright and you can locate them where they can have their topgrowth sticking out into a little sun for part of the day you can add dogwood, redbud and Chinese witchhazel (Loropetalum).
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